Generalized Bedrock Geology Map
|The map on ESRT page 3
serves three purposes the first of which is to find the latitude and
longitude of any location in NYS to an accuracy of about 5 or 10
If you are asked to find latitude or longitude or both you should, using a straight edge, draw in the lines of latitude and longitude (see red lines on map).
For accuracy you might need to draw the 77°30' longitude line or the 42°30' latitude line (shown in yellow). When drawing these lines look for the marks as shown highlighted here in yellow. They designate the midway point (30') between degrees.
You should know that every latitude on this map is a NORTH latitude and every longitude is a WEST longitude.
You should know that the vertical lines are lines of longitude and that all the horizontal lines are lines of latitude.
You should know that every NY longitude is in the 70s and that all NY latitudes are in the 40s.
|The second purpose is to find the distance between any two points in NYS. For this we use the scale located at the bottom, right. Need help finding the distance between two points in New York State? Click here to see a helpful powerpoint.|
|The third use for this map is to
visualize the bedrock that underlies the loose rock and soil (regolith)
that covers the State.
Using the key is simple enough however the are a few time-saving things you ought to know:
> If you are asked to find metamorphic rock or the oldest rock in the State (1 billion years old) look to the Adirondack mountains (red outline) or rarely the the area just north or NYC (also red outlined).
> It's difficult to find Pennsylvanian & Mississippian rock. Follow the red arrow from the key to the area near Jamestown where this rock is found.
> Although this is a 'bedrock' geology map the 'cretaceous and Pleistocene gravels, sands, and clays' that are found on Long Island are not bedrock at all but are actually glacial deposits on top of much older bedrock, not shown. Follow the blue arrow.
> Most of New York State is composed of sedimentary bedrock formed by deposition of material in the shallow seas that once covered the State.
|Important: Many of the questions which reference this map require the use of other ESRT pages as well. You may be asked about the landscape in which a city is located. This requires ESRT pages 2 and 3. You may be asked about where certain fossils might be found. This requires pages 8/9 and 3. To answer questions about the minerals found at a certain location might require information from pages 3,6,7, and 16.|
Practice Questions for ESRT Page 3
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