G E O L O G I C M A P O F T H E G R I S S O M 7 . 5 ...
Descriptionof Ma pU nits
78 37' 30"
78 30' 00"
45
CZmca
80
CZfu
75 72 74
Trcs/si2 FISHING
Trcs/si2
Jd
60
60
89 89 72
80
CZmg
57
25 88
65 65
55
80 75
82
50
Trcs/c
U M31
64
54
65
60
81
78
55
CZmcg
57
55
45
63
79
67
48
66
71 55
35
Jd
65
49
56
CZfu
52
61 29
p
62
44 64
CZfa
88
60
47
51
CZfa
CZfa
71
40 64
42
62
56
71
CZfu
49
56
52
52
68
48 38
CZfu
37 34
CZfa
62
54
36
35 62
48
50
89
62
17
CZfu
30
43
54
64
45
CZfs
33
50
71
47
48
44
44
CZfs
73
Qal
53
50
CZfa
36
33 61
CZfs
CZfa
47
60
65
CZfa
42
55
22
6
38
37
CZfu 36
30
CZfu
50
74 75
48
25
CZfu
53
78
45
36
CZfu 63
Jd
65
18
LT PF AU
86
24
CZmgs 84
87 52
57
72
61
60
50
CZmcg
CZrl
CZcwq
55
RAL EI GHT ERRANE
38
68
78
69
50 80
76
48
60
CZfu
66
87
82
78
23
13
10
24
12
10
53
23
74
37
55
54
44
63
36 25 49 32
65
18
60
CZfu
9
42
18
48
CZfs CZfu
24
89 50
41 28
72 25
CZfa
CZfu
25
20
74
8
40
87
LT
21
43
38
47
55
11
82 65
Jd
CZfut
Qal
p
CZrgn
80
88
A' 70
48
67
49
51 53
CZrgn
CZflg
37
Qal
88
REFERENCES
57
CZrgn
CZcwq
Blake, D.E., 1986, The geology of the Grissom area, Franklin, Granville, and Wake Counties, North Carolina: A structural and metamorphic analyses [M.S. thesis]: Raleigh, North Carolina State University, 300 p.
36 00' 00"
36 00' 00" 78 37' 30"
Horton, J.W., Jr., Blake, D.E., Wylie, A.S., Jr., and Stoddard, E.F., 1992, Geologic map of the Falls Lake - Wake Forest area, north-central North Carolina: U.S. Geological Survey Open File Report 92-269, scale 1:24,000, 9 p.
78 30' 00" S CAL E1: 24000
MN
0.95
0.475
0
Moye, R. J., Jr., 1981, The Bayleaf mafic-ultramafic belt, Wake and Granville counties, North Carolina, Unpublished M.S. thesis, North Carolina State University, Raleigh, NC, 115 p.
0.95
GN
Miles
1 26'
0
0.95
1,000
2,000
0.475
3,000
4,000
0
25MI LS
5,000
6,000
EX PL ANAT I ONOFMAPS Y MBOL S
0.95 Kilometers
CONT OU R I NT ERVAL 10FEET U T M GRI DAND1987MAGNET I C NORT H DECL I NAT I ONAT CENT ER OFS HEET
LOWERY CREEK
SR 1917
DUCTILE THRUST FAULT SR 1915
MUD SR 1922 BRANCH
Robitaille, K. R., 2004, Geology and terrane relationships of the Tar River area, Franklin and Granville Counties, North Carolina, Unpublished M.S. Thesis, Wilmington, University of North Carolina at Wilmington, 167p.
NORTH CAROLINA
7,000 Feet
WAKE CO. FRANKLIN CO.
1,000 500
124MI LS
CZ rl-finegra ined leucocra tic gneiss:Very light gray, fine-grained, leucocratic epidote-plagioclase-quartz gneiss, locally containing darker, hornblende-bearing interlayers.
PzZgg
40
7
CZrl
24
31
50
Phillips and Witanachchi
CZ hg -hornblende gneiss:Dark gray to black, medium grained, poorly to moderately foliated hornblende-plagioclase gneiss and amphibolite. May contain biotite or epidote. Where biotite content is high may be somewhat schistose.
CZrl
Qal
60 27
CZ rgn-Ra leigh gneiss:Mixed unit consisting mainly of fine- to coarse-grained, well foliated, compositionally banded, and locally lineated biotite granitoid gneiss, and lesser amounts of biotite + hornblende gneiss, biotite schist, white mica schist, and amphibolite.
CZhg
13 10
Jd
CZ flg -Fa llsleucogneiss:Leucocratic (CI less than 5) pink-gray to orange-tan, medium-grained, weakly to moderately foliated and strongly lineated, biotite magnetite granitic gneiss.
77
45
CZfut
CZflg
83
Qal
59
47
45
82
88
71
59
Qal
88
79
53
4
CZfs
DUCTILE THRUST FAU
20 24
68
86 80
50 47
48
11
WES T
CZ cwq-White m ica rich a nd qua rtzrich schist:gold-gray to silver-gray, very fine- to fine-grained, moderately well foliated quartz-biotite and/or chlorite-white mica schist containing sparse to abundant garnet interlayered with silver-white, fine- to medium grained, moderately foliated white mica-plagioclase-quartz schist.
Qal
70
68
CZ m gs-m ixed gneissa nd schist:Complex assemblage of highly intercalated gneissic and schistose rocks. Includes quartzofeldspathic gneiss, compositionally layered gneiss, quartz ribbon gneiss, amphibolite, hornblende gneiss, hornblendite, banded biotite gneiss, muscovite schist, muscovite-garnet gneiss, biotite-muscovite-garnet schist, talc schist, and quartzite.
83
74
21
Blake, Grosser and Robitaille
CZ bg -biotite ba nded gneiss:White, gray, and black, compositional layered and well foliated, biotite-quartz-plagioclase gneiss.
84 10
25
68
70
Jd
Unidirectional Rose Diagram of Joints N = 61
CZbg
CZhg
78
21
A
Qal p
88
CZbg
48
66
22
CZ m ca -Middle Creek gneiss,m a fic fa cies:Dark grayish-black to dark green, fine- to medium-grained, foliated and lineated, layered, epidote-bearing hornblende gneiss to aphibolite. Locally contains opaque mineral-rich metapyroxenite.
45
73
14
29
79
CZ m cg -Middle Creek gneiss:Fine- to coarse-grained, gneissic to schistose, locally lineated, mesocratic (CI less than 30), biotite quartz dioritic to granodioritic gneiss. Interlayered with pink-gray to orange-tan, fine- to medium-grained, locally lineated, leucocratic (CI less than 10), white mica biotite granitoid gneiss, and fine- to medium-grained amphibolitic gneiss. Also occurs as tectonic windows within Falls Lake terrane.
CZmca
66
Qal
77 58
70
66
35 7
CZfu
32
23
31
49
72
51
18
89
35
57
84 54
27
CZmcg
72
83
CZ fua -a ctinolite rock a nd a ctinolitechlorite schist:dark green, schistose to almost massive, splintery rock composed of actinolite and varied amounts of chlorite; minor amounts of talc and magnetite octrahedra are common. CRABT REET ERRANE
44
15
CZhg
59
40
29
CZfua
CZ fqz-qua rtzite:White, granular, and well foliated quartzite.
55 52
54
56
68
88
17
36
61
56
67
80 49
57
CZfut
48
41
79
26
46
12
57
57
18
CZfqz
73
74
44
60
27
27
52
35
25
49
42
78
21 34
36
18
62
50
55 44
38
52
6
33
79
37
11 15
10
29
45
33 29
79
33
8
58
39
19
46
47
75
4
35
12
64
26
37
53
47
74
17
35
43
61
49
45
26
25
35
46 22
30
37
48
33
30
CZrgn
72
Jd
23
54
55
80
41
Jd
35
48
59
62
47
18
45 57
CZflg
47
47
7
55 20
p
p
23
39
89
64
28
52
42
5
33
26
47
60
Qal
42
32
CZfu
63 44
24 24
27
42
37
54
CZfu CZfa
CZmcg
65
p
20
CZhg
65
89 80
47
CZfs
70
Schmidt net equal-area plot of contoured mineral, elongation, and stretch lineations (n = 65)
62
43
58
70
44
43
54 24 82
CZ m g -m eta ga bbro:Light green to blue green, fine- to medium-grained, massive metagabbro containing relict plagioclase and hornblende, and metamorphic actinolite, epidote, and opaque minerals.
60
36
26
27
69
68
44
37
20
12
26
42
20
44
CZmg
74
55
18
20
30
58
44
33
53
40
59
CZfu
CZfu
CZfa CZmcg
53
17
30
23
CZfu
CZ fut-ta lc schist:White to gray talc-tremolite schist, talc-chlorite schist, and soapstone. Rhombohedral cavities suggest former presence of a carbonate mineral (ankerite?).
43
22
7
70
52
55
39
72
CZfu
75 76
70
39
53
58
27
60
-SL I
CZfu
33 23
36
CZfu
63
60
55
60
77
63
23
31
11
Jd 42
CZfut
Qal
26
24
24
45
81
85
30
ILE
47 64
40
48
19
76
26
Qal
51 47
80
12
10
CZ hg -hornblende gneiss:Dark gray to black, medium grained, poorly to moderately foliated hornblende-plagioclase gneiss and amphibolite. May contain biotite or epidote. Where biotite content is high may be somewhat schistose.
67
CZhg
18
CZhg
60
60
77
30
34 40
CZ fa -a m phibolite:Dark gray, fine- to medium-grained, and well foliated amphibolite.
60 62
20
33
CZ fu -ultra m a fic rocks( undivided) :Variably altered ultramafic rocks including metapyroxenite, actinolite-chlorite schist, and talc schist.
60
73
DUC T
78
CZfa
51
55
56
23
36
87
26 45
CZbg
27
41
81
47 49
60
CZ fs-Fa llsL a ke schist:Variably gray colored, mesocratic, medium- to coarse-grained, biotite-white mica-oligoclase-quartz schist locally having garnet, staurolite, kyanite, and chlorite porphyroblasts. Contains pods of gabbro, amphibolite, and undivided ultramafic rocks.
44
PF AU L T
35
CZfu
Jd
21
56
25
88
87
p
30
83 36
60
60
Jd
53
55
70
85
36
53
54
57
48
57
27 12
78
52
16
30
45
PPccg
35
46
50
9
15
23 83 59
CZmcg
62
60
47
33
35
66
38
19
20
CZfa
34
11
45
56
22
9
30
51
54
60
22
6
38
72
30
38
CZfs
57
20
S TR IKE
48
78
4
70
5
38
22
55
75 59
38 31
23
30
CZmcg
62
35
10
32
CZhg
60 44
CZfs
30
40 47
CZfs
CZfu
23
CZfu
44
60
32
30
79
60
CZfu
37
47
52
24
FAL L S L AKET ERRANE
60
21 21
42
CZ bp-Bea verda m suite:Mixed assemblage of biotite- and hornblende-biotite metadiorite; hornblende metagabbro; and metapyroxenite.
53
37
63
36
12
69
35
12 47
50
CZbp
61
19
41
63 47
49 61
49
CZfu
13
33
41 68
58
77
32
23
CZfu
56
10 50
75
CZ ct-Ca rolina terra ne m eta gra nitoid:Orange-tan to pinkish tan, fine- to medium-grained, highly fractured, leucocratic (CI generally less than 5), biotite-bearing metatrondjhemite to metagranodiorite. Locally, biotite can increase in abundance and or be replaced by chlorite. Gray to bluish gray quartz phenocrysts are conspicuous, and the metagranitoid is locally porphyritic. Zones of silicification and pyritization are present.
50
40 35
33 31
48
CZrgn
31
28
15
25
42
78
56
31
CZ gc -GibbsCreek pluton:Light green to gray-green, fine- to medium-grained, leucocratic (CI less than 20) biotite +hornblende metagranodiorite. Locally contains planar zones of dark green to gray-green, fine-grained, well foliated and lineated, chlorite phyllite having a phyllonitic fabric.
CZflg
CZct
37
60
47
CZgc
64
48
35
63
86
CZflg
26
50
65
84
Cpu
DUCTILE FAULT
HORSE SR 1925 CREEK
SR 1909
A
US 1
CONT ACT S
MAP LOCATION
Lithologic contacts - Distribution and concentration of structural symbols indicates degree of reliability.
SR 1135
Qal
Qal
contact - gradational
A' 0
CZfs
EAS T
A
A'
CZfu CZfu
Jd
CZfs
-2000'
Jd
CZmcg
CZflg A
plunging synform
contact - location concealed
CZrl
CZfu
plunging antiform
contact - location inferred
RICHLAND CREEK
0
Phillips and Witanachchi
CAROL I NAT ERRANE
Meta m orphic Rocks
29
50
PzZ gg -gneissic biotite gra nitoid ( Pa leozoic?) :Foliated biotite granitoid and granitoid orthogneiss interlayered with Raleigh gneiss.
Jd
74
78
16 60
69
2 4
40
PzZgg
26
48 43
54
88
3 70
14
46
33
73
64
68 14
49
p 18
PPccg – Gra nite of the Ceda r Creek pluton:Pink-white, medium to coarse-grained, unfoliated to moderately foliated and lineated biotite granite, with local pegmatite.
p-pegm a tite:Gray-white to pink-white, very coarse grained, microcline, plagioclase, quartz, muscovite, biotite pegmatite of the Rolesville granite. Some outcrops exhibit a graphic texture.
p
68
44
59
83
86
55
63
28
p
1
54 44
74
25
66
36
p
17
65
34
82
CZfu
58 40
PPccg
42
35
67
54
CZfa
PPccg
70
74
Jd -dia ba se dikes:Steeply dipping to vertical dikes of gray to bluish-black, fine- to medium-grained, locally porphyritic plagioclase diabase, that may be olivine-bearing. Solid lines where observed; dashed lines where inferred from correlation and aeromagnetic data.
65
46
40
62
56 63
44
63
5
48
35 42
58
28 59 83
Jd
48
79
39
50
51
52
48 72
60
17
66
74
34
58
Schmidt net equal-area plot of contoured poles to shear foliation (n = 103)
20
54
45
55
72
57
49
10
47
72
47
67
55
Qal
45
40
65
57
30
T rsb -silicified breccia :Light gray to white, silicified rock that has been multiply brecciated and annealed. Contains angular clasts of probable pre-Triassic rock along the Jonesboro fault.
22
48
41
54
5
60
55 58 40 50 50 68
GS 46
82
CZmgs
CZfu
71
48
44 88
48
59 34 39
47
53
80
57
7
43
p
60
67
23 54
T rcs/ si2-sa ndstone w/interbedded siltstone:Cyclical depositional sequences of whitish-yellow to grayish-pink to pale red, coarse- to very coarse-grained, trough cross-bedded lithic arkose that fines upward through yellow to reddish-brown, mediumto fine-grained sandstone, to reddish-brown, burrowed and rooted siltstone. Bioturbation is usually surrounded by greenishblue to gray reduction halos. Coarse-grained portions contain abundant muscovite, and basal gravel lags consist of clasts of quartz, bluish-gray quartz crystal tuff, and mudstone rip-ups.
I ntrusive Rocks
CZrgn
CZmcg
40
72
59
41
50
T rcs/ c -sa ndstone with interbedded conglom era te: Reddish-brown to dark brown, irregularly bedded, poorly sorted, coarse-grained to pebbly, muddy lithic sandstones with interbedded pebble to cobble conglomerate. Muscovite is rare to absent in the matrix. Well-defined conglomerate beds distinguish this unit from conglomerate basal lags of Trcs. An arbitrary cut-off of less than 50 percent conglomerate distinguishes this unit from the Trcc conglomerate facies. Conglomerate beds are channel-shaped and scour into the underlying sandstone beds. Unit grades eastward into Trcc.
50
-SL I
LT FA U RU ST
69
57
48
69
46
52
45
Trsb
77
70
54
61
CZfua
61 75 85
30
70
62
65
68
59
69
T rcc -conglom era te:Reddish-brown to dark brown, irregularly bedded, poorly sorted, cobble to boulder conglomerate. Muscovite is rare to absent in the very coarse-grained to gravelly matrix. An arbitrary cut-off of greater than 50 percent conglomerate distinguishes this unit from the Trcs/c facies. Clasts are chiefly miscellaneous felsic and intermediate metavolcanic rocks, quartz, epidote, bluish- gray quartz crystal tuff, muscovite schist, and rare meta-granitic material.
81
66
85
72
89
10
48
71
65
52
72
70
69
35
40
72
45
85
65
5 45
80
55
66
72
57 51
58
CZfa
82
75 2
88
6
55
55
CZfs
76
60
70
30
72 54
69
53
64
80
CZfqz
20 54 46 46
45
Trcs/si2
30
75 75
70
85
50
75
67
75
76
37
68
76
GS 39
69 60
CZfu
30 30 50
49 40 39 25 26 31 28 74 88 37 30 43 52 38 49 56 49
CZfs
45
52
70 72
79 78
45
71
CZfu
55
66
79
79 57
84
70 40
U M313
CZbp
Qal
48
62
83 83
Trcc
45 44 56
49
55
CZhg
71
63
35 75
70
CZfa
85 86 72
51
42
45
59 55 45
79
80
74
71
83 77 48 73 62 80 80 72 68 60 57 65 65 76 82
46
72
65
62 79
76
5
Trsb
Trcs/c
Pennsylvanian
Trcc
80 77
52 50
60
54
45
40 63
LE
50
CZfa
76 70 76 81 80
80
O OR
88
Neo-Proterozic to Late Paleozoic
66
68
59
65
65
75
77 61 47 75 43 58 85 37 88
60
Trcc
65 47
Qal 70
51 66
79
SB
81
69 72 64
65
NE JO
88
87
Trcs/c
70
TH
70
T UL FA
GS 56
89
84
54
63
40
51 62
55
72 61
58
70 75
79
83
15
72 51
TR IKE
63 81
CZfs 75
1
85
52
CZmcg
DU CT ILE S
Qal
69
78
60
Trcc
Jurassic
35 78
DU CT I
23
Jd
CZflg
50
62
73
Trcc
72
Qal
70
65
Trcs/si2
Cpu -Coa sta lPla insedim ents,undifferentia ted:Unconsolidated, fine to coarse-grained, tan to light gray arkosic sands and clayey sands with occasional gravel.
72
67
16
67
30
64
40
Cpu
Newa rk S upergroup,Cha tha m Group
74
Qal
8 80
82
Schmidt net equal-area plot of contoured poles to regional foliation (n = 909)
72
37
70
77
76
60 52 45
77
77
70
45
75
57
68 46
Qal
62
Qa l-Qua terna ry a lluvium :Unconsolidated, poorly-sorted and poorly stratified, tan to light gray deposits of gravel, sand, silt, and clay. Similar to stratified terraces along streams.
50 70
64
55 67
3
75 74
50
50
70
CZfs Trcs/si2
75 60
CZrgn
64 55 32
63 80
70
59
53 61 60
75
CZmcg
JO N ESB O
80
40
78 66 88
82
70
25 80
51
81
CZct
55
8
88
62
73
Qal
Jd
0
73
AULT CREEK F
Qal
Jd
Trsb
RO FA UL T
Trcs/si2
CZmca
CZmcg CZmg
Qal
Late Triassic
CZgc
Pliocene (?) Quaternary
75
36 07' 30"
S urficia lU nits 36 07' 30"
Neo-Proterozoic to Cambrian
Jenny Kelvington, Executive Director Kenneth B. Taylor, State Geologist
North Carolina Geological Survey Open File Report 2016-20
antiform cross section line synform
in cross section, inferred axial trace of large-scale fold CZrgn
normal fault, bar and ball on the downthrown side, dashed where inferred
in cross section, interpreted fold form lines of non-cylindrical asymmetric folds
-2000
T PzZgg
ductile strike-slip fault, dashed where inferred
CZfu
INDEX TO GEOLOGIC MAPPING
CZbg
-4000'
in cross section, normal fault arrows indicate movement
-4000'
no vertical exaggeration measurement in feet below ground surface
A
T
in cross section, A indicates movement away from observer, T indicates movement towards observer
thrust fault
PL ANARFEAT U RES strike and dip of inclined bedding in Triassic sedimentary rocks
23
strike and dip of inclined bedding in Triassic sedimentary rocks
N.C.
GEOL OGI CMAPOFT HEGRI S S OM 7. 5MI NU T EQU ADRANGL E, GRANVI L L E,FRANKL I N,ANDWAKECOU NT I ES ,NORT HCAROL I NA Geology by David E. Blake, Cindy M. Phillips, Benjamin D. Grosser, Kenneth R. Robitaille and Channa Witanachchi. Also incorporating previous mapping by Blake (1986) and Horton and others (1992). Digital representation by Michael A. Medina and Cindy M. Phillips 2016
strike and dip of axial surface of F2 fold
33
strike and dip of axial surface of F3 fold
46
strike and dip of vertical biotite foliation in granitoid
strike and dip of inclined regional foliation (Srs)
61
strike and dip of vertical fracture surface
strike and dip of vertical regional C or C' foliation
strike and dip of inclined compositional layering
55
strike and dip of inclined fracture surface
65
strike and dip of inclined regional C or C' foliation
72
strike and dip of inclined pegmatite dike
55
ADJOINING 7.5' QUADRANGLES
strike and dip of vertical regional foliation (Srs)
strike and dip of axial surface of F4 fold
57
LI NEARFEAT U RES
14
bearing and plunge of mineral lineation
28
bearing and plunge of slickenline
36
bearing and plunge of minor fold hinge (F3)
35
bearing and plunge of mineral stretch lineation
57
bearing and plunge of minor fold hinge (F2)
47
bearing and plunge of minor fold hinge (F4)
U M31
OT HERFEAT U RES whole-rock geochemical sample location Samples UM-3-1 thru UM-3-13 collected along same transect. Not all points are indicated on map due to small sampling area.
Base topographic map is digital raster graphic image of the Grissom 7.5-minute USGS quadrangle (1987). Geology compiled from Blake (1986), Horton et al. (1992), Robitalle (2004), and data collected by NCGS staff in 2001-2002. Partially supported by the USGS National Cooperative Mapping Program EDMAP and STATEMAP components. Mapping and research of Robitalle (2004) supported by EDMAP. Mapping by NCGS staff partially supported by STATEMAP grants 01HQAG0061 (2001) and 02HQAG0043 (2002). Disclaimer: This Open-File report is preliminary and has been reviewed for conformity with the North Carolina Geological Survey editorial standards or with the North American Stratigraphic Code. Further revisions or corrections to this map may occur.
Grissom 7.5-minute Quadrangle, Open File Report 2016-20
This Geologic map was funded in part by the USGS National Cooperative Geologic Mapping Program
North Carolina Department of Environmental Quality Energy Group
78 37' 30"
78 30' 00"
45
CZmca
80
CZfu
75 72 74
Trcs/si2 FISHING
Trcs/si2
Jd
60
60
89 89 72
80
CZmg
57
25 88
65 65
55
80 75
82
50
Trcs/c
U M31
64
54
65
60
81
78
55
CZmcg
57
55
45
63
79
67
48
66
71 55
35
Jd
65
49
56
CZfu
52
61 29
p
62
44 64
CZfa
88
60
47
51
CZfa
CZfa
71
40 64
42
62
56
71
CZfu
49
56
52
52
68
48 38
CZfu
37 34
CZfa
62
54
36
35 62
48
50
89
62
17
CZfu
30
43
54
64
45
CZfs
33
50
71
47
48
44
44
CZfs
73
Qal
53
50
CZfa
36
33 61
CZfs
CZfa
47
60
65
CZfa
42
55
22
6
38
37
CZfu 36
30
CZfu
50
74 75
48
25
CZfu
53
78
45
36
CZfu 63
Jd
65
18
LT PF AU
86
24
CZmgs 84
87 52
57
72
61
60
50
CZmcg
CZrl
CZcwq
55
RAL EI GHT ERRANE
38
68
78
69
50 80
76
48
60
CZfu
66
87
82
78
23
13
10
24
12
10
53
23
74
37
55
54
44
63
36 25 49 32
65
18
60
CZfu
9
42
18
48
CZfs CZfu
24
89 50
41 28
72 25
CZfa
CZfu
25
20
74
8
40
87
LT
21
43
38
47
55
11
82 65
Jd
CZfut
Qal
p
CZrgn
80
88
A' 70
48
67
49
51 53
CZrgn
CZflg
37
Qal
88
REFERENCES
57
CZrgn
CZcwq
Blake, D.E., 1986, The geology of the Grissom area, Franklin, Granville, and Wake Counties, North Carolina: A structural and metamorphic analyses [M.S. thesis]: Raleigh, North Carolina State University, 300 p.
36 00' 00"
36 00' 00" 78 37' 30"
Horton, J.W., Jr., Blake, D.E., Wylie, A.S., Jr., and Stoddard, E.F., 1992, Geologic map of the Falls Lake - Wake Forest area, north-central North Carolina: U.S. Geological Survey Open File Report 92-269, scale 1:24,000, 9 p.
78 30' 00" S CAL E1: 24000
MN
0.95
0.475
0
Moye, R. J., Jr., 1981, The Bayleaf mafic-ultramafic belt, Wake and Granville counties, North Carolina, Unpublished M.S. thesis, North Carolina State University, Raleigh, NC, 115 p.
0.95
GN
Miles
1 26'
0
0.95
1,000
2,000
0.475
3,000
4,000
0
25MI LS
5,000
6,000
EX PL ANAT I ONOFMAPS Y MBOL S
0.95 Kilometers
CONT OU R I NT ERVAL 10FEET U T M GRI DAND1987MAGNET I C NORT H DECL I NAT I ONAT CENT ER OFS HEET
LOWERY CREEK
SR 1917
DUCTILE THRUST FAULT SR 1915
MUD SR 1922 BRANCH
Robitaille, K. R., 2004, Geology and terrane relationships of the Tar River area, Franklin and Granville Counties, North Carolina, Unpublished M.S. Thesis, Wilmington, University of North Carolina at Wilmington, 167p.
NORTH CAROLINA
7,000 Feet
WAKE CO. FRANKLIN CO.
1,000 500
124MI LS
CZ rl-finegra ined leucocra tic gneiss:Very light gray, fine-grained, leucocratic epidote-plagioclase-quartz gneiss, locally containing darker, hornblende-bearing interlayers.
PzZgg
40
7
CZrl
24
31
50
Phillips and Witanachchi
CZ hg -hornblende gneiss:Dark gray to black, medium grained, poorly to moderately foliated hornblende-plagioclase gneiss and amphibolite. May contain biotite or epidote. Where biotite content is high may be somewhat schistose.
CZrl
Qal
60 27
CZ rgn-Ra leigh gneiss:Mixed unit consisting mainly of fine- to coarse-grained, well foliated, compositionally banded, and locally lineated biotite granitoid gneiss, and lesser amounts of biotite + hornblende gneiss, biotite schist, white mica schist, and amphibolite.
CZhg
13 10
Jd
CZ flg -Fa llsleucogneiss:Leucocratic (CI less than 5) pink-gray to orange-tan, medium-grained, weakly to moderately foliated and strongly lineated, biotite magnetite granitic gneiss.
77
45
CZfut
CZflg
83
Qal
59
47
45
82
88
71
59
Qal
88
79
53
4
CZfs
DUCTILE THRUST FAU
20 24
68
86 80
50 47
48
11
WES T
CZ cwq-White m ica rich a nd qua rtzrich schist:gold-gray to silver-gray, very fine- to fine-grained, moderately well foliated quartz-biotite and/or chlorite-white mica schist containing sparse to abundant garnet interlayered with silver-white, fine- to medium grained, moderately foliated white mica-plagioclase-quartz schist.
Qal
70
68
CZ m gs-m ixed gneissa nd schist:Complex assemblage of highly intercalated gneissic and schistose rocks. Includes quartzofeldspathic gneiss, compositionally layered gneiss, quartz ribbon gneiss, amphibolite, hornblende gneiss, hornblendite, banded biotite gneiss, muscovite schist, muscovite-garnet gneiss, biotite-muscovite-garnet schist, talc schist, and quartzite.
83
74
21
Blake, Grosser and Robitaille
CZ bg -biotite ba nded gneiss:White, gray, and black, compositional layered and well foliated, biotite-quartz-plagioclase gneiss.
84 10
25
68
70
Jd
Unidirectional Rose Diagram of Joints N = 61
CZbg
CZhg
78
21
A
Qal p
88
CZbg
48
66
22
CZ m ca -Middle Creek gneiss,m a fic fa cies:Dark grayish-black to dark green, fine- to medium-grained, foliated and lineated, layered, epidote-bearing hornblende gneiss to aphibolite. Locally contains opaque mineral-rich metapyroxenite.
45
73
14
29
79
CZ m cg -Middle Creek gneiss:Fine- to coarse-grained, gneissic to schistose, locally lineated, mesocratic (CI less than 30), biotite quartz dioritic to granodioritic gneiss. Interlayered with pink-gray to orange-tan, fine- to medium-grained, locally lineated, leucocratic (CI less than 10), white mica biotite granitoid gneiss, and fine- to medium-grained amphibolitic gneiss. Also occurs as tectonic windows within Falls Lake terrane.
CZmca
66
Qal
77 58
70
66
35 7
CZfu
32
23
31
49
72
51
18
89
35
57
84 54
27
CZmcg
72
83
CZ fua -a ctinolite rock a nd a ctinolitechlorite schist:dark green, schistose to almost massive, splintery rock composed of actinolite and varied amounts of chlorite; minor amounts of talc and magnetite octrahedra are common. CRABT REET ERRANE
44
15
CZhg
59
40
29
CZfua
CZ fqz-qua rtzite:White, granular, and well foliated quartzite.
55 52
54
56
68
88
17
36
61
56
67
80 49
57
CZfut
48
41
79
26
46
12
57
57
18
CZfqz
73
74
44
60
27
27
52
35
25
49
42
78
21 34
36
18
62
50
55 44
38
52
6
33
79
37
11 15
10
29
45
33 29
79
33
8
58
39
19
46
47
75
4
35
12
64
26
37
53
47
74
17
35
43
61
49
45
26
25
35
46 22
30
37
48
33
30
CZrgn
72
Jd
23
54
55
80
41
Jd
35
48
59
62
47
18
45 57
CZflg
47
47
7
55 20
p
p
23
39
89
64
28
52
42
5
33
26
47
60
Qal
42
32
CZfu
63 44
24 24
27
42
37
54
CZfu CZfa
CZmcg
65
p
20
CZhg
65
89 80
47
CZfs
70
Schmidt net equal-area plot of contoured mineral, elongation, and stretch lineations (n = 65)
62
43
58
70
44
43
54 24 82
CZ m g -m eta ga bbro:Light green to blue green, fine- to medium-grained, massive metagabbro containing relict plagioclase and hornblende, and metamorphic actinolite, epidote, and opaque minerals.
60
36
26
27
69
68
44
37
20
12
26
42
20
44
CZmg
74
55
18
20
30
58
44
33
53
40
59
CZfu
CZfu
CZfa CZmcg
53
17
30
23
CZfu
CZ fut-ta lc schist:White to gray talc-tremolite schist, talc-chlorite schist, and soapstone. Rhombohedral cavities suggest former presence of a carbonate mineral (ankerite?).
43
22
7
70
52
55
39
72
CZfu
75 76
70
39
53
58
27
60
-SL I
CZfu
33 23
36
CZfu
63
60
55
60
77
63
23
31
11
Jd 42
CZfut
Qal
26
24
24
45
81
85
30
ILE
47 64
40
48
19
76
26
Qal
51 47
80
12
10
CZ hg -hornblende gneiss:Dark gray to black, medium grained, poorly to moderately foliated hornblende-plagioclase gneiss and amphibolite. May contain biotite or epidote. Where biotite content is high may be somewhat schistose.
67
CZhg
18
CZhg
60
60
77
30
34 40
CZ fa -a m phibolite:Dark gray, fine- to medium-grained, and well foliated amphibolite.
60 62
20
33
CZ fu -ultra m a fic rocks( undivided) :Variably altered ultramafic rocks including metapyroxenite, actinolite-chlorite schist, and talc schist.
60
73
DUC T
78
CZfa
51
55
56
23
36
87
26 45
CZbg
27
41
81
47 49
60
CZ fs-Fa llsL a ke schist:Variably gray colored, mesocratic, medium- to coarse-grained, biotite-white mica-oligoclase-quartz schist locally having garnet, staurolite, kyanite, and chlorite porphyroblasts. Contains pods of gabbro, amphibolite, and undivided ultramafic rocks.
44
PF AU L T
35
CZfu
Jd
21
56
25
88
87
p
30
83 36
60
60
Jd
53
55
70
85
36
53
54
57
48
57
27 12
78
52
16
30
45
PPccg
35
46
50
9
15
23 83 59
CZmcg
62
60
47
33
35
66
38
19
20
CZfa
34
11
45
56
22
9
30
51
54
60
22
6
38
72
30
38
CZfs
57
20
S TR IKE
48
78
4
70
5
38
22
55
75 59
38 31
23
30
CZmcg
62
35
10
32
CZhg
60 44
CZfs
30
40 47
CZfs
CZfu
23
CZfu
44
60
32
30
79
60
CZfu
37
47
52
24
FAL L S L AKET ERRANE
60
21 21
42
CZ bp-Bea verda m suite:Mixed assemblage of biotite- and hornblende-biotite metadiorite; hornblende metagabbro; and metapyroxenite.
53
37
63
36
12
69
35
12 47
50
CZbp
61
19
41
63 47
49 61
49
CZfu
13
33
41 68
58
77
32
23
CZfu
56
10 50
75
CZ ct-Ca rolina terra ne m eta gra nitoid:Orange-tan to pinkish tan, fine- to medium-grained, highly fractured, leucocratic (CI generally less than 5), biotite-bearing metatrondjhemite to metagranodiorite. Locally, biotite can increase in abundance and or be replaced by chlorite. Gray to bluish gray quartz phenocrysts are conspicuous, and the metagranitoid is locally porphyritic. Zones of silicification and pyritization are present.
50
40 35
33 31
48
CZrgn
31
28
15
25
42
78
56
31
CZ gc -GibbsCreek pluton:Light green to gray-green, fine- to medium-grained, leucocratic (CI less than 20) biotite +hornblende metagranodiorite. Locally contains planar zones of dark green to gray-green, fine-grained, well foliated and lineated, chlorite phyllite having a phyllonitic fabric.
CZflg
CZct
37
60
47
CZgc
64
48
35
63
86
CZflg
26
50
65
84
Cpu
DUCTILE FAULT
HORSE SR 1925 CREEK
SR 1909
A
US 1
CONT ACT S
MAP LOCATION
Lithologic contacts - Distribution and concentration of structural symbols indicates degree of reliability.
SR 1135
Qal
Qal
contact - gradational
A' 0
CZfs
EAS T
A
A'
CZfu CZfu
Jd
CZfs
-2000'
Jd
CZmcg
CZflg A
plunging synform
contact - location concealed
CZrl
CZfu
plunging antiform
contact - location inferred
RICHLAND CREEK
0
Phillips and Witanachchi
CAROL I NAT ERRANE
Meta m orphic Rocks
29
50
PzZ gg -gneissic biotite gra nitoid ( Pa leozoic?) :Foliated biotite granitoid and granitoid orthogneiss interlayered with Raleigh gneiss.
Jd
74
78
16 60
69
2 4
40
PzZgg
26
48 43
54
88
3 70
14
46
33
73
64
68 14
49
p 18
PPccg – Gra nite of the Ceda r Creek pluton:Pink-white, medium to coarse-grained, unfoliated to moderately foliated and lineated biotite granite, with local pegmatite.
p-pegm a tite:Gray-white to pink-white, very coarse grained, microcline, plagioclase, quartz, muscovite, biotite pegmatite of the Rolesville granite. Some outcrops exhibit a graphic texture.
p
68
44
59
83
86
55
63
28
p
1
54 44
74
25
66
36
p
17
65
34
82
CZfu
58 40
PPccg
42
35
67
54
CZfa
PPccg
70
74
Jd -dia ba se dikes:Steeply dipping to vertical dikes of gray to bluish-black, fine- to medium-grained, locally porphyritic plagioclase diabase, that may be olivine-bearing. Solid lines where observed; dashed lines where inferred from correlation and aeromagnetic data.
65
46
40
62
56 63
44
63
5
48
35 42
58
28 59 83
Jd
48
79
39
50
51
52
48 72
60
17
66
74
34
58
Schmidt net equal-area plot of contoured poles to shear foliation (n = 103)
20
54
45
55
72
57
49
10
47
72
47
67
55
Qal
45
40
65
57
30
T rsb -silicified breccia :Light gray to white, silicified rock that has been multiply brecciated and annealed. Contains angular clasts of probable pre-Triassic rock along the Jonesboro fault.
22
48
41
54
5
60
55 58 40 50 50 68
GS 46
82
CZmgs
CZfu
71
48
44 88
48
59 34 39
47
53
80
57
7
43
p
60
67
23 54
T rcs/ si2-sa ndstone w/interbedded siltstone:Cyclical depositional sequences of whitish-yellow to grayish-pink to pale red, coarse- to very coarse-grained, trough cross-bedded lithic arkose that fines upward through yellow to reddish-brown, mediumto fine-grained sandstone, to reddish-brown, burrowed and rooted siltstone. Bioturbation is usually surrounded by greenishblue to gray reduction halos. Coarse-grained portions contain abundant muscovite, and basal gravel lags consist of clasts of quartz, bluish-gray quartz crystal tuff, and mudstone rip-ups.
I ntrusive Rocks
CZrgn
CZmcg
40
72
59
41
50
T rcs/ c -sa ndstone with interbedded conglom era te: Reddish-brown to dark brown, irregularly bedded, poorly sorted, coarse-grained to pebbly, muddy lithic sandstones with interbedded pebble to cobble conglomerate. Muscovite is rare to absent in the matrix. Well-defined conglomerate beds distinguish this unit from conglomerate basal lags of Trcs. An arbitrary cut-off of less than 50 percent conglomerate distinguishes this unit from the Trcc conglomerate facies. Conglomerate beds are channel-shaped and scour into the underlying sandstone beds. Unit grades eastward into Trcc.
50
-SL I
LT FA U RU ST
69
57
48
69
46
52
45
Trsb
77
70
54
61
CZfua
61 75 85
30
70
62
65
68
59
69
T rcc -conglom era te:Reddish-brown to dark brown, irregularly bedded, poorly sorted, cobble to boulder conglomerate. Muscovite is rare to absent in the very coarse-grained to gravelly matrix. An arbitrary cut-off of greater than 50 percent conglomerate distinguishes this unit from the Trcs/c facies. Clasts are chiefly miscellaneous felsic and intermediate metavolcanic rocks, quartz, epidote, bluish- gray quartz crystal tuff, muscovite schist, and rare meta-granitic material.
81
66
85
72
89
10
48
71
65
52
72
70
69
35
40
72
45
85
65
5 45
80
55
66
72
57 51
58
CZfa
82
75 2
88
6
55
55
CZfs
76
60
70
30
72 54
69
53
64
80
CZfqz
20 54 46 46
45
Trcs/si2
30
75 75
70
85
50
75
67
75
76
37
68
76
GS 39
69 60
CZfu
30 30 50
49 40 39 25 26 31 28 74 88 37 30 43 52 38 49 56 49
CZfs
45
52
70 72
79 78
45
71
CZfu
55
66
79
79 57
84
70 40
U M313
CZbp
Qal
48
62
83 83
Trcc
45 44 56
49
55
CZhg
71
63
35 75
70
CZfa
85 86 72
51
42
45
59 55 45
79
80
74
71
83 77 48 73 62 80 80 72 68 60 57 65 65 76 82
46
72
65
62 79
76
5
Trsb
Trcs/c
Pennsylvanian
Trcc
80 77
52 50
60
54
45
40 63
LE
50
CZfa
76 70 76 81 80
80
O OR
88
Neo-Proterozic to Late Paleozoic
66
68
59
65
65
75
77 61 47 75 43 58 85 37 88
60
Trcc
65 47
Qal 70
51 66
79
SB
81
69 72 64
65
NE JO
88
87
Trcs/c
70
TH
70
T UL FA
GS 56
89
84
54
63
40
51 62
55
72 61
58
70 75
79
83
15
72 51
TR IKE
63 81
CZfs 75
1
85
52
CZmcg
DU CT ILE S
Qal
69
78
60
Trcc
Jurassic
35 78
DU CT I
23
Jd
CZflg
50
62
73
Trcc
72
Qal
70
65
Trcs/si2
Cpu -Coa sta lPla insedim ents,undifferentia ted:Unconsolidated, fine to coarse-grained, tan to light gray arkosic sands and clayey sands with occasional gravel.
72
67
16
67
30
64
40
Cpu
Newa rk S upergroup,Cha tha m Group
74
Qal
8 80
82
Schmidt net equal-area plot of contoured poles to regional foliation (n = 909)
72
37
70
77
76
60 52 45
77
77
70
45
75
57
68 46
Qal
62
Qa l-Qua terna ry a lluvium :Unconsolidated, poorly-sorted and poorly stratified, tan to light gray deposits of gravel, sand, silt, and clay. Similar to stratified terraces along streams.
50 70
64
55 67
3
75 74
50
50
70
CZfs Trcs/si2
75 60
CZrgn
64 55 32
63 80
70
59
53 61 60
75
CZmcg
JO N ESB O
80
40
78 66 88
82
70
25 80
51
81
CZct
55
8
88
62
73
Qal
Jd
0
73
AULT CREEK F
Qal
Jd
Trsb
RO FA UL T
Trcs/si2
CZmca
CZmcg CZmg
Qal
Late Triassic
CZgc
Pliocene (?) Quaternary
75
36 07' 30"
S urficia lU nits 36 07' 30"
Neo-Proterozoic to Cambrian
Jenny Kelvington, Executive Director Kenneth B. Taylor, State Geologist
North Carolina Geological Survey Open File Report 2016-20
antiform cross section line synform
in cross section, inferred axial trace of large-scale fold CZrgn
normal fault, bar and ball on the downthrown side, dashed where inferred
in cross section, interpreted fold form lines of non-cylindrical asymmetric folds
-2000
T PzZgg
ductile strike-slip fault, dashed where inferred
CZfu
INDEX TO GEOLOGIC MAPPING
CZbg
-4000'
in cross section, normal fault arrows indicate movement
-4000'
no vertical exaggeration measurement in feet below ground surface
A
T
in cross section, A indicates movement away from observer, T indicates movement towards observer
thrust fault
PL ANARFEAT U RES strike and dip of inclined bedding in Triassic sedimentary rocks
23
strike and dip of inclined bedding in Triassic sedimentary rocks
N.C.
GEOL OGI CMAPOFT HEGRI S S OM 7. 5MI NU T EQU ADRANGL E, GRANVI L L E,FRANKL I N,ANDWAKECOU NT I ES ,NORT HCAROL I NA Geology by David E. Blake, Cindy M. Phillips, Benjamin D. Grosser, Kenneth R. Robitaille and Channa Witanachchi. Also incorporating previous mapping by Blake (1986) and Horton and others (1992). Digital representation by Michael A. Medina and Cindy M. Phillips 2016
strike and dip of axial surface of F2 fold
33
strike and dip of axial surface of F3 fold
46
strike and dip of vertical biotite foliation in granitoid
strike and dip of inclined regional foliation (Srs)
61
strike and dip of vertical fracture surface
strike and dip of vertical regional C or C' foliation
strike and dip of inclined compositional layering
55
strike and dip of inclined fracture surface
65
strike and dip of inclined regional C or C' foliation
72
strike and dip of inclined pegmatite dike
55
ADJOINING 7.5' QUADRANGLES
strike and dip of vertical regional foliation (Srs)
strike and dip of axial surface of F4 fold
57
LI NEARFEAT U RES
14
bearing and plunge of mineral lineation
28
bearing and plunge of slickenline
36
bearing and plunge of minor fold hinge (F3)
35
bearing and plunge of mineral stretch lineation
57
bearing and plunge of minor fold hinge (F2)
47
bearing and plunge of minor fold hinge (F4)
U M31
OT HERFEAT U RES whole-rock geochemical sample location Samples UM-3-1 thru UM-3-13 collected along same transect. Not all points are indicated on map due to small sampling area.
Base topographic map is digital raster graphic image of the Grissom 7.5-minute USGS quadrangle (1987). Geology compiled from Blake (1986), Horton et al. (1992), Robitalle (2004), and data collected by NCGS staff in 2001-2002. Partially supported by the USGS National Cooperative Mapping Program EDMAP and STATEMAP components. Mapping and research of Robitalle (2004) supported by EDMAP. Mapping by NCGS staff partially supported by STATEMAP grants 01HQAG0061 (2001) and 02HQAG0043 (2002). Disclaimer: This Open-File report is preliminary and has been reviewed for conformity with the North Carolina Geological Survey editorial standards or with the North American Stratigraphic Code. Further revisions or corrections to this map may occur.
Grissom 7.5-minute Quadrangle, Open File Report 2016-20
This Geologic map was funded in part by the USGS National Cooperative Geologic Mapping Program
North Carolina Department of Environmental Quality Energy Group
