Geologic Map of the Maritime Provinces

Steven Dutch, Professor Emeritus, Natural and Applied Sciences, Universityof Wisconsin - Green Bay

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One pixel = 1 km

Geology with One-Degree Grid

Geology with Offshore Units

No grid version is shown because offshore contacts are approximate and very subject to interpretation. No highway version is shown because, do you really need highways for a map of offshore geology?

Geology with Highways

US and Canadian highways are red, interstates and Canadian equivalents are gold.  Refer to a road map for route numbers - this map is busy enough without them! I recommend using the plain map for geologic interpretation, with this map used for more specific location information.

Topography

Legend

Marine refers to well-stratified rocks mostly (but not entirely) ofmarine origin. Eugeo refers to eugeosynclinal rocks, that is, deep-watersedimentary rocks of continental slope or trench origin. Other headings areself-explanatory.

There are about 160 lithologic units on the Geologic Map of the United Statesby King and Beikman, counting units with metamorphic overprint. The 256 Colorson an 8-bit Color palette are more than enough to show these, but many of theColors are very hard to distinguish by eye. Colors were chosen to minimizeconfusion as much as possible, but inevitably there will be adjacent Colors thatare hard to tell apart. To improve contrast, a few Colors have been duplicatedfor units widely separated in space and time. For example, Colors for earlyPaleozoic volcanic units (found only in the Appalachians) have also been usedfor some units in the far West.

Some periods are divided in some locations and undivided in others. Undividedperiods generally use the middle Color for the period. In practice this seems toresult in little confusion. If adjacent units are other divisions of the period,the Color represents a subdivision. If adjacent units are different periods, theunit is undivided.

Symbols

Periods

Units of undivided age

Combinations of symbols refer to transitional or undivided units. For exampleDS refers to undivided Devonian and Silurian rocks.

Prefixes

Suffixes

References

Principal sources for data. Links, even those of government agencies, go out of date quickly and are mostly not provided. Search by title and publication number to find links to data.

Conterminous US Geology
US Geological Survey: Mineral Resources; Geology of the conterminous United States. A digital version of the Geologic Map of the United States, originally published at a scale of 1:2,500,000 (King and Beikman, 1974b). Excludes Alaska and Hawaii.
Detailed Geology of States
US Geological Survey: Mineral Resources: Online Spatial Data; Geologic maps of US states
US Bouguer Gravity
US Geological Survey: Mineral Resources; Online Spatial Data; Gravity anomaly grids for the conterminous US
US Isostatic Gravity
US Geological Survey: Mineral Resources; Online Spatial Data; Gravity anomaly grids for the conterminous US
US Magnetic Anomalies
  • US Geological Survey: Digital data grids for the magnetic anomaly map of North America: Open-File Report 02-414
  • Digital Aeromagnetic Datasets for the Conterminous United States and Hawaii - A Companion to the North American Magnetic Anomaly Map, U.S. Geological Survey Open-File Report 02-361
  • Digitized Aeromagnetic Datasets for the Conterminous United States, Hawaii, and Puerto Rico, U.S. Geological Survey Open-File Report 99-0557
Canada Geology
Wheeler, J.O., Hoffman, P.F., Card, K.D., Davidson, A., Sanford, B.V., Okulitch, A.V., and Roest, W.R. (comp.) 1997: Geological Map of Canada, Geological Survey of Canada, Map D1860A.
Canada Bouguer Gravity and Magnetic
Natural Resources Canada; Earth Sciences Sector; Geoscience Data Repository
Magnetic Anomalies outside US
US Geological Survey: Digital data grids for the magnetic anomaly map of North America: Open-File Report 02-414
Offshore Geology
Mostly from US Geological Survey; Resources for the Geologic Map of North America; GIS Files (shapefiles); (ESRI geodatabase only is USGS DR-424)
Western Mexico Geology
US Geological Survey; Resources for the Geologic Map of North America; GIS Files (shapefiles); (ESRI geodatabase only is USGS DR-424)
Eastern Mexico and Gulf of Mexico Geology
US Geological Survey OFR 97-470-L; Map Showing Geology, Oil and Gas Fields, and Geologic Provinces of the Gulf of Mexico Region; Digitally Compiled by Christopher D. French and Christopher J. Schenk
Caribbean Geology
  • US Geological Survey OFR 97-470-K; Map Showing Geology, Oil and Gas Fields, and Geologic Provinces of the Caribbean Region; Digitally Compiled by Christopher D. French and Christopher J. Schenk
  • Hearn, P., Jr., Hare, T., Schruben, P., Sherrill, D., LaMar, C., and Tsushima, P., 2001, Global GIS Database, Digital Atlas of Central and South America: U.S. Geological Survey Digital Data Series DDS-62-A. [on-line] available at: http://webgis.wr.usgs.gov/globalgis/
  • U.S. Geological Survey World Energy Assessment Team, 2000, U.S. Geological Survey World Petroleum Assessment 2000: U.S. Geological Survey Digital Data Series DDS-60, 4 CD-ROMs. [on-line] available at: http://pubs.usgs.gov/dds/dds-060
Arctic Offshore and Greenland
Maps showing Geology, Oil and Gas Fields, and Geologic Provinces of the Arctic; Compiled by Feliks M. Persits and Gregory F. Ulmishek; U.S. Geological Survey Open File Report 97-470-J
Ocean Floor Isochrons
Muller, R. D., M. Sdrolias, C. Gaina, and W. R. Roest (2008), Age, spreading rates, and spreading asymmetry of the world's ocean crust, Geochem. Geophys. Geosyst., 9, Q04006, doi:10.1029/2007GC001743. On-line through NOAA;  Age, spreading rates and spreading symmetry of the world's ocean crust (Version 3, September 2008) Contoured using Global Mapper 14.

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Created 23 July 2001, Last Update 15 January 2020