Old Greensand-Diatomaceous Earth Pit, Calvert Co., Maryland, USA
Diatomaceous earth and glauconitic greensand producer from the Miocene Calvert Formation.
Development Status: Past Producer
| Glauconite|| Opal|
2 entries listed. 1 valid mineral.
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Pearre, Nancy (1961) Mineral deposits of Maryland excluding fuel, sand and gravel: U.S. Geological Survey Mineral Investigations Resources Map MR-12.
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