Where can I find geological maps?
The National Geologic Map Database (NGMDB) is the primary source for geologic map and related geoscience information of the United States.
Where is bedrock in the US?
| Bedrock, Colorado | |
|---|---|
| Bedrock, Colorado Location within the state of Colorado | |
| Coordinates: 38°18′54″N 108°53′27″WCoordinates: 38°18′54″N 108°53′27″W | |
| Country | United States |
| State | Colorado |
What types of geologic maps are available?
There are three major types of geologic maps: topographic, cross-sectional, and structural:
- Topographic maps are maps where locations of equal elevation are connected by lines called contour lines.
- Cross-sectional maps show a side-view of a segment line drawn on a topographic map.
What is the average depth of bedrock?
Bedrock is either exposed at the earth surface or buried under soil and regolith, sometimes over a thousand meters deep.
Why is Massachusetts soil so rocky?
They all ended up in Massachusetts because continents kept colliding together here, compacting rocks into tight bands, generally in a north-south direction. Over subsequent millions of years, the great mountains created by these collisions then eroded.
When was the bedrock geology of Massachusetts published?
A two-volume text, The Bedrock Geology of Massachusetts, published in 1991, accompanies the map. The publication is catalogued as U.S. Geological Survey Professional Paper 1366 A-D (western Mass.) and 1366 E-J (eastern Mass.) A variety of ways to download the map and text are listed in “Other Links” below.
Is there a GIS database for Massachusetts geologic units?
A GIS database of geologic units and structural features in Massachusetts, with lithology, age, data structure, and format written and arranged just like the other states. Show in a web browser window:
Where can I find a scanned bedrock map?
A scanned version of this map is available in ESRI MrSID format from the USGS here. A surfable, scanned, version of the bedrock map is part of the Dynamic Digital Map of New England.