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Cannon, William F. , McRae, Michele E. , and Nicholson, Suzanne W. , 1999, Geology and Mineral Deposits of the Keweenaw Peninsula and Vicinity, Michigan: U.S. Geological Survey Open-File Report 99-0149.Online Links:
This is a vector data set. It contains the following vector data types (SDTS terminology):
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest unknown
Ordinates (y-coordinates) are specified to the nearest unknown
Planar coordinates are specified in meters
The horizontal datum used is NAD27.
The ellipsoid used is CLARKE 1866.
The semi-major axis of the ellipsoid used is 6378206.
The flattening of the ellipsoid used is 1/294.98.
Value | Definition |
---|---|
Pzu | Paleozoic undivided |
Yj | Jacobsville Sandstone |
Yf | Freda Sandstone |
Yfa | Freda Sandstone, andesite member |
Yn | Nonesuch Formation |
Yc | Copper Harbor Conglomerate |
Ycb | Copper Harbor Conglomerate, Basalt Member |
Yi | Indiana felsite |
Yfi | Intrusive Rhyolite |
Yb | Mt. Bohemia stock |
Ypl | Portage Lake Volcanics undivided |
Yplf | Rhyolite: Portage Lake Volcanics |
Yplg | Greenstone Flow: Portage Lake Volcanics |
Yplk | Kearsarge Flow: Portage Lake Volcanics |
Yplgr | Gratiot Flow: Portage Lake Volcanics |
Ypls | Scales Creek Flow: Portage Lake Volcanics |
Yplc | Copper City Flow: Portage Lake Volcanics |
Yplb | Bohemia Conglomerate: Portage Lake Volcanics |
Yd | Diabase dikes |
Ypu | Powder Miss Group undivided |
Ys | Siemens Creek Volcanics |
Xm | Michigamme Formation |
Wgr | Granitic gneiss |
Value | Definition |
---|---|
Marquette Range | |
Keweenawan | |
(blank) |
Value | Definition |
---|---|
Baraga | |
Bergland | |
Oronto | |
Powder Mill | |
(blank) |
Value | Definition |
---|---|
Proterozoic | |
Paleozoic | |
Archean |
Value | Definition |
---|---|
undivided | No definite period |
Late Archean | |
Early Proterozoic | |
Middle Proterozoic |
Value | Definition |
---|---|
Sedimentary | |
Metamorphic | |
Intrusive | |
Extrusive |
Value | Definition |
---|---|
graywacke | Michigamme Unit |
Lake Shore Traps | Copper Harbor Conglomerate Unit |
Bear Lake Andesite | Freda Sandstone Unit |
Bohemia Conglomerate | Portage Lake Volcanics member |
Copper City Flow | Portage Lake Volcanics member |
felsite | Portage Lake Volcanics member |
Greenstone flow | Portage Lake Volcanics member |
Gratiot Flow | Portage Lake Volcanics member |
Kearsarge flow | Portage Lake Volcanics member |
Scales Creek Flow | Portage Lake Volcanics member |
(blank) | No Subunit_name |
Value | Definition |
---|---|
(blank) | Age unknown |
Range of values | |
---|---|
Minimum: | 1086 |
Maximum: | 2750 |
Units: | millions of years ago |
Resolution: | 1 |
Value | Definition |
---|---|
Carbonate | |
Conglomerate | |
Felsic | |
Intermediate | |
Mafic | |
Metasedimentary | |
Mudstone | |
Sandstone | |
gneiss |
Value | Definition |
---|---|
andesite | |
basalt | |
black shale | |
conglomerate | |
diabase | |
felsite | |
granitic gneiss | |
limestone | |
metagraywacke | |
rhyolite |
Value | Definition |
---|---|
Extrusive | |
Intrusive | |
Metamorphic | |
Sedimentary | |
(blank) |
Value | Definition |
---|---|
Amphibolite | |
Carbonate | |
Conglomerate | |
Intermediate | |
Metasedimentary | |
Mudstone | |
Sandstone | |
(blank) |
Value | Definition |
---|---|
amphibolite | |
andesite | |
arkose | |
conglomerate | |
diorite | |
dolomite | |
sandstone | |
siltstone | |
slate | |
(blank) |
Value | Definition |
---|---|
Extrusive | |
Intrusive | |
Sedimentary | |
(blank) |
Value | Definition |
---|---|
Felsic | |
Mudstone | |
Sandstone | |
(blank) |
Value | Definition |
---|---|
granite | |
rhyolite | |
sandstone | |
siltstone | |
(blank) |
Value | Definition |
---|---|
Interior platform | |
Midcontinent rift | |
Penokean | |
Superior |
Value | Definition |
---|---|
Fold and thrust belt | |
Wawa | |
central horst | |
flanking basin | |
(blank) |
Value | Definition |
---|---|
Early Proterozoic | |
Late Archean | |
Middle Proterozoic | |
Paleozoic |
Value | Definition |
---|---|
Penokean, Fold and thrust belt, Early Proterozoic | |
(blank) |
Value | Definition |
---|---|
andesite dome | |
dike | |
felsic dome | |
fluvial | |
fluvial, lacustrine | |
interflow conglomerate | |
lacustrine | |
marine | |
shallow marine | |
subaerial flood basalt | |
undetermined |
Value | Definition |
---|---|
Post-rife thermal basin | |
continental rift basin | |
foreland basin | |
stable craton | |
undetermined |
Value | Definition |
---|---|
black shale | |
carbonate, clastic sediments | |
coarse clastic sediments | |
coarse clastic sediments, metamorphosed | |
felsic intrusive | |
felsic volcanics | |
gneiss complex | |
intermediate volcanics | |
mafic dikes | |
mafic volcanics |
Value | Definition |
---|---|
Primary Roads | |
Secondary Roads | |
Light Duty Roads | |
Other Street | |
Trails |
Value | Definition |
---|---|
Limestone Mtn. Structural Zone | |
syncline |
Value | Definition |
---|---|
Strike & Dip of Bedding | |
strike & dip of foliation or cleavage | |
strike & dip of overturned bedding | |
strike of vertical bed |
Range of values | |
---|---|
Minimum: | 1 |
Maximum: | 342 |
Units: | degrees |
Resolution: | 1 |
Range of values | |
---|---|
Minimum: | 5 |
Maximum: | 90 |
Units: | degrees |
Resolution: | 1 |
Range of values | |
---|---|
Minimum: | 0 |
Maximum: | 358 |
Units: | degrees |
Resolution: | 1 |
ARC/INFO .e00 files: ATTITUDE - Orientation of bedding features (e.g., strike and dip) BURIED - Features concealed by Jacobsville Sandstone CGL - Interflow conglomerates CHALC - Chalcocite bodies COORD - A 15X15 minute geographic latitude/longitude locator grid FISSURE - Fissure veins GEOLOGY - Geologic units and faults LAKES - Lakes LODES - Native copper lodes MAG - Distinct aeromagnetic trends MINES - Mine shafts in the native copper district OUTCROPS - Locations of outcrops RIVERS - Rivers and streams ROADS - Roads STRUCTUR - Major structural features (other than faults) WETLANDS - Wetlands, marshes, bogs, etc. XSECTION - Cross section lines
(703) 648-7345 (voice)
wcannon@usgs.gov
This database is intended to summarize and update a wealth of very detailed geologic maps of the region. The related hardcopy publication, Geologic Map of the Keweenaw Peninsula and Adjacent Area, Michigan (Cannon and Nicholson), is part of a set of maps portraying the regional geology of the Midcontinent rift on the south shore of Lake Superior.
The geology and mineral deposits of the district have been painstakingly studied for many years. Milestones in the studies were the extensive report of Butler and Burbank (1929) and the detailed geologic maps produced by the USGS in the 1950's. The latter were aided greatly by the Calumet and Hecla Copper Company which provided USGS geologists with a wealth of exploration and production data that allowed construction of detailed 1:24,000 scale maps for the entire peninsula. Those maps are the principal source of information used to compile this data set. We have attempted to preserve as much detail as possible at 1:100,000 scale. For rocks northwest of the Keweenaw fault we have made few changes to previously mapped geology. New data is limited to deposits of chalcocite and native copper discovered since the previous mapping in the 1950's, to a more detailed study of rhyolite bodies, and to radiometric age determinations. For areas southeast of the Keweenaw fault, new geophysical data and drill holes allow some new inferences about the geology of volcanic rocks covered by a thin veneer of Jacobsville Sandstone.
complete
This digital database was compiled from a variety of sources which are documented on the file README.doc.
Are there legal restrictions on access or use of the data?
- Access_Constraints: None
- Use_Constraints: None
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1-303-202-4693 (FAX)
This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
This database, identified as "Geology and Mineral Deposits of the Keweenaw Peninsula and Vicinity, Michigan" has been approved for release and publication by the Director of the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use.
Data format: | gzipped ArcView project and coverages - Keweenaw.zip (version ArcView 7.1.2) Size: 3 megabytes |
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Network links: |
<http://pubs.usgs.gov/openfile/of99-149/keweenaw.zip> |
Data format: | gzipped .e00 files - e00files.zip (version ArcView 3.1) Size: 3 megabytes |
---|---|
Network links: |
<http://pubs.usgs.gov/openfile/of99-149/e00files.zip> |
703-648-6974 (voice)
703-648-6560 (FAX)
pschweitzer@usgs.gov