- GeoRef, Copyright 2008, American Geological Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Dissolved inorganic phosphorus concentrations in estuaries are commonly high enough to cause phosphatization of calcium carbonate. The large phosphorus values are due to the high productivity of organisms, especially plants. The areal distribution, stratigraphy, mineralogy, and fossils of the Tertiary Atlantic coastal plain phosphorite support a near-shore, probably estuarine origin for the deposits.