Karl, Susan M. , Haeussler, Peter J. , and McCafferty, Anne E. , 1999, Reconnaissance geologic map of the Duncan Canal/Zarembo Island area, southeastern Alaska: U.S. Geological Survey Open-File Report OFR 99-168.
This is a Vector data set.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 150
Ordinates (y-coordinates) are specified to the nearest 150
Planar coordinates are specified in meters
| Value | Definition |
|---|---|
| 1 | Stratigraphic contact, certain location |
| 2 | Stratigraphic contact, approximate location |
| 7 | Shoreline or riverbank |
| 9 | Boundary of altered zone or hornfels |
| 10 | Thrust fault, certain location; teeth on right from origin |
| 11 | Thrust fault, location approximate; teeth on right from origin |
| 15 | Ice contact |
| 30 | Fault, sense of displacement uncertain, location certain |
| 31 | Fault, sense of displacement uncertain, location approximate |
| 50 | Dikes and sills |
| 51 | Concealed contact |
| 52 | Concealed fault |
| 53 | Concealed thrust fault |
| 55 | Concealed normal fault, having right lateral oblique slip |
| 56 | Concealed normal fault, having left lateral oblique slip |
| 71 | Normal fault, having right lateral oblique slip, location certain |
| 72 | Normal fault, having right lateral oblique slip, location approximate |
| 73 | Normal fault, having left lateral oblique slip, location certain |
| 74 | Normal fault, having left lateral oblique slip, location approximate |
| 88 | Right lateral fault, location approximate |
| 98 | latitude and longitude marks used for cartography |
| 99 | Bounding line of coverage |
| Value | Definition |
|---|---|
| 2 | Qs - Surficial deposits (Quaternary) |
| 3 | Qb - Basalt (Quaternary) |
| 4 | QTv - Vent breccia (Quaternary and Tertiary) |
| 5 | QTa - Andesite (Quaternary and Tertiary) |
| 6 | QTc - Volcaniclastic deposits (Quaternary and Tertiary) |
| 7 | QTr - Rhyolite (Quaternary and Tertiary) |
| 8 | QTb - Basalt (Quaternary and Tertiary) |
| 9 | QTd - Dikes, sills, and intrusive rocks (Quaternary and Tertiary) |
| 11 | Tmae - Alkali granite (Tertiary) |
| 12 | Tmge - Granite (Tertiary) |
| 13 | Tmme - Migmatite (Tertiary) |
| 14 | Tmaz - Alkali granite (Tertiary) |
| 15 | Tmgk - Granitic rocks (Tertiary) |
| 16 | Tmdk - Diorite (Tertiary) |
| 19 | Tk - Kootznahoo Formation (Tertiary) |
| 20 | Kwqo - Quartz monzodiorite (Cretaceous) |
| 24 | Kbdu - Dunite (Cretaceous) |
| 25 | Kbwh - Wherlite (Cretaceous) |
| 26 | Kbgb - Gabbro (Cretaceous) |
| 30 | TRhl - Hyd Group limestone (Triassic) |
| 31 | TRhb - Hyd Group breccia (Triassic) |
| 32 | Pp - Pybus Formation (Permian) |
| 33 | PCsy - Syenite (Permian to Pennsylvanian) |
| 36 | Sch - Heceta Limestone (Lower to Upper Silurian) |
| 37 | Schc - Polymictic conglomerate of the Heceta Limestone (Lower to Upper Silurian) |
| 38 | Scp - Polymictic conglomerate (Silurian) |
| 39 | Stbg - Bay of Pillars Formation graywacke turbidites (Silurian) |
| 40 | Stbc - Bay of Pillars Formation polymictic conglomerate (Silurian) |
| 41 | Stbo - Bay of Pillars Formation olistostrome deposits (Silurian) |
| 42 | Stpg - Bay of Pillars Formation graywacke (Lower to Upper Silurian) |
| 43 | Stpc - Bay of Pillars Formation conglomerate (Silurian) |
| 44 | SOdg - Descon Formation graywacke (Lower Ordovician to Lower Silurian) |
| 45 | SOdl - Descon Formation limestone (Lower Ordovician to Upper Silurian) |
| 49 | KJsg - Seymour Canal Formation greenstone (Cretaceous and Jurassic) |
| 50 | Ktif - Tonalite (Cretaceous) |
| 51 | Ktop - Tonalite porphyry (Cretaceous) |
| 52 | Ktoc - Tonalite porphyry (Cretaceous) |
| 53 | Kqop - Quartz monzodiorite (Cretaceous) |
| 54 | Kqo - Quartz monzodiorite (Cretaceous) |
| 55 | Kdi - Diorite (Cretaceous) |
| 56 | Kuk - Ultramafic complex (Cretaceous) |
| 57 | Khb - Hornblendite (Cretaceous) |
| 58 | KJsv - Seymour Canal Formation volcanic rocks (Cretaceous and Jurassic) |
| 59 | KJss - Seymour Canal Formation (Cretaceous and Jurassic) |
| 67 | Mzg - Gabbro (Mesozoic) |
| 70 | TRhv - Hyd Group volcanic rocks (Triassic) |
| 71 | Dls - Fossiliferous limestone (Lower and Middle Devonian) |
| 72 | Tdr - Rhyolite (Tertiary) |
| 74 | Tag - Alaskite granite (Tertiary) |
| 75 | Tlgm - Leucocratic granodioritic migmatite (Tertiary) |
| 76 | Tgdp - Porphyritic granodiorite (Tertiary) |
| 77 | Tgrg - Gneissic granite and granodiorite (Tertiary) |
| 78 | Tgdb - Granodiorite and quartz diorite (Tertiary) |
| 80 | Tlg - Leucocratic granite and granodiorite (Tertiary) |
| 81 | Tgd - Granodiorite (Tertiary) |
| 82 | Ttom - Tonalite migmatite (Tertiary) |
| 83 | Tto - Tonalite (Tertiary) |
| 84 | Tgdg - Gneissic granodiorite (Tertiary) |
| 85 | MzPzp - Phyllite (Mesozoic and Paleozoic) |
| 86 | MzPzbs - Biotite schist (Mesozoic and Paleozoic) |
| 87 | MzPzsc - Schistose conglomerate (Mesozoic and Paleozoic) |
| 88 | MzPzhs - Hornblende schist (Mesozoic and Paleozoic) |
| 89 | MzPzm - Marble (Mesozoic and Paleozoic) |
| 90 | MzPzbg - Biotite gneiss (Mesozoic and Paleozoic) |
| 91 | MzPzhg - Hornblende gneiss (Mesozoic and Paleozoic) |
| 92 | MzPzgn - Gneiss (Mesozoic and Paleozoic) |
| 93 | Kmgf - Granodioritic migmatite (Cretaceous) |
| 94 | Ktef - Tonalite (Cretaceous) |
| 95 | Ktob - Tonalite (Cretaceous) |
| 96 | Kgb - Gabbro (Cretaceous) |
| 101 | Ice |
| 102 | Water |
| 106 | TRhsv - Hyd Group sedimentary and volcanic rocks (Triassic) |
| 107 | PMc - Cannery Formation (Permian and Mississippian) |
| 109 | Dsv - Metasedimentary and metavolcanic rocks (Devonian) |
| 110 | Tqdz - Quartz diorite (Tertiary) |
| 111 | Qls - Landslide deposits (Quaternary) |
| 113 | TRha - Hyd Group argillite (Triassic) |
| 114 | TRh - Hyd Group (Triassic) |
| 115 | Tgbk - Gabbro (Tertiary) |
| 116 | TRh? - Hyd Group? (Triassic) |
| 117 | PzpCm - Metamorphic rocks (Paleozoic and Precambrian) |
| 119 | Ki - Intrusive rocks (Cretaceous) |
| 121 | Mzi - Intrusive rocks (Mesozoic) |
| 123 | Qb? - Basalt? (Quaternary) |
| 127 | Ti - Intermediate intrusive rocks (Tertiary) |
| 131 | MzPzsv - Metasedimentary and metavolcanic rocks (Mesozoic and Paleozoic) |
| 134 | Tmqe - Quartz diorite and diorite (Tertiary) |
| 137 | KJsm - Stephens Passage Group sedimentary rocks of Marsh Island (Cretaceous) |
| 139 | Tgdm - Gneissic granodioritic migmatite (Tertiary) |
| 200 | dike |
| 10038 | Scp - hornfels Scp |
| 10039 | Stbg - hornfels Stbg |
| 10042 | Stpg - hornfels Stpg |
| 10043 | Stpc - hornfels Stpc |
| 1044 | SOdg - hornfels SOdg |
| 10059 | KJss - hornfels KJss |
| Value | Definition |
|---|---|
| 20 | strike and dip of bedding |
| 49 | strike of bedding, upright |
| 50 | strike of dip of bedding, overturned |
| 51 | strike and dip of foliation in intrusive rocks |
| 52 | strike and dip of foliation |
Kelly Brunt, Raytheon STX contractor
U.S. Geological Survey
c/o Susan M. Karl
4200 University Drive
Anchorage, AK 99508-4667
USA
907-561-1181 (voice)
skarl@usgs.gov
The purpose of this geologic map is to identify and understand the sources of geophysical anomalies found during airborne geophysical survey in 1997. This area was selected for the geophysical survey because of its high mineral potential.
The linework was captured by hand digitizing from 1:63,360 scale stable base maps. The coverage was edited and topology was built. The arcs and polygons were attributed. The linework was captured by hand digitizing from field compilations on stable base mylar at 1:63,360 scale. Vector and polygon attributes were obtained from field maps and compilations. The digital data has been visually checked and the geologic map has undergone technical review.
Users of this digital geologic map should respect the intentions of the original mappers and map compilers, and the limitations of the map. The Duncan Canal/Zarembo Island area geologic map is intended to be used at a scale of 1:150,000; it is not intended to be used at a more detailed scale.
These digital files are the geospatial files used to create the geologic map. Files for the correlation of map units and cross-sections are not included.
The geology coverage, dzgeol, is a network coverage containing arcs and polygons. Each polygon has a coded attribute designating the mapped geologic unit. Faults and stratigraphic contacts are represented as arcs. When a fault is also a stratigraphic contact, only a single arc is present. Dangling arcs may be present (faults, dikes, etc.)
Coverage dzfossil is a point data set showing the locations of fossil samples. The data set includes fossil identification, stratigraphic age, color alteratioin index, and name of the identifier.
Coverage dzstruct is a point data set containing strike and dip information for bedding and foliation.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints: None
USGS Information Services
Box 25286
Denver Federal Center
Denver, CO 80225-0046
USA
303-202-4200 or 1-888-ASK-USGS (voice)
USGS OFR 99-168
Although this data has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data, software, or related materials.
| Data format: | ARCE |
|---|---|
| Network links: |
<http://geopubs.wr.usgs.gov/open-file/of99-168> |
U.S. Geological Survey
c/o Nora Shew
4200 University Drive
Anchorage, AK 99508-4667
USA
907-786-7445 (voice)
nshew@usgs.gov