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1 Department of Environmental Science and Geology, 1301 College Avenue, Jepson Science Center, Mary Washington College, Fredericksburg VA 22401. E-mail: ntibert{at}mwc.edu
2 Department of Geosciences, 611 North Pleasant St., University of Massachusetts, Amherst MA 01003.
Agglutinated foraminifera provide high-resolution proxies for relative sea level change in Late Cretaceous coal-bearing strata. Three foraminiferal assemblages are recognized where Trochammina (trochospiral) occurs in abundance with either one of the following: 1) Miliammina (quinqueloculine) associated with carbonaceous shale, interpreted as the marsh; 2) Ammobaculites (uncoiled) and estuarine ostracodes associated with shelly mudstones, interpreted as the central, muddy estuary; and 3) Verneulinoides and Textularia (serial) associated with gray mudstones, interpreted as distal estuary (open bay). The marsh represents 01 m water depth and this approximates absolute mean sea level, the central estuary represents 58 m water depth, and the distal estuary (open bay) represents water depths of 10 m or greater. Alternations between foraminiferal associations in a 25-m section of the upper middle Turonian Smoky Hollow Member, Straight Cliffs Formation, indicate sea level amplitude changes that ranged from 110 meters.
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