St. Mary's City, St. Mary's Co., Maryland, USA
|Latitude & Longitude (WGS84):||38° 11' 14'' North , 76° 26' 3'' West|
|Latitude & Longitude (decimal):||38.18724,-76.43432|
|Köppen climate type:||Cfa : Humid subtropical climate|
Clusters of gypsum crystals are known from excavations in clay around the city.
1 valid mineral.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
0.0117 - 2.588 Ma
Age: Pleistocene (0.0117 - 2.588 Ma)
Description: Gravel, sand, silt, and clay. Medium- to coarse-grained sand and gravel; cobbles and boulders near base; commonly contains reworked Eocene glauconite; varicolored silts and clays; brown to dark gray lignitic silty clay; contains estuarine to marine fauna in some areas (includes in part Pamlico, Talbot, Wicomico and Sunderland Formations of earlier reports); thickness 0 to 150 feet.
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052.