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Calvert Cliffs, Calvert Co., Maryland, USA

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Latitude & Longitude (WGS84): 38° 24' 18'' North , 76° 24' 36'' West
Latitude & Longitude (decimal): 38.40515,-76.41012
Köppen climate type:Cfa : Humid subtropical climate


Calvert Cliffs is partly in a state park, and is renowned for its Miocene fossils, of which collecting is allowed. Deposits of iron and manganese minerals as crusts, nodular and botryoidal aggregates occur near Calvert Cliffs along various seeps. These are biominerals, produced by microbial precipitation.


Mineral List


7 valid minerals.

Regional Geology

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

Miocene
5.333 - 23.03 Ma



ID: 2901841
Chesapeake Group; Choptank Formation

Age: Miocene (5.333 - 23.03 Ma)

Stratigraphic Name: Choptank Formation

Description: Interbedded brown to yellow very fine-grained to fine-grained sand and gray to dark bluish-green argillaceous silt; locally indurated to calcareous sandstone; prominent shell beds; thickness 0 to 50 feet.

Lithology: Major:{sand,silt}, Minor:{sandstone}, Incidental:{coquina}

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. [133]

Miocene
5.333 - 23.03 Ma



ID: 3192743
Cenozoic sedimentary rocks

Age: Miocene (5.333 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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