OSTRACODE BIOSTRATIGRAPHY OF THE YORKTOWN FORMATION (UPPER MIOCENE AND LOWER PLIOCENE) OF VIRGINIA AND NORTH CAROLINA: GEOLOGICAL SURVEY PROFESSIONAL PAPER 704
Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1971. Soft cover. Three ostracode assemblage zones are proposed for deposits assigned to the Yorktown Formation. The older two zones are considered to be late Miocene in age and the youngest early Pliocene. 13 pages with maps, tables, figures and references. Bound..... More