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The Arundel Clay facies of the Potomac Group represents one of the few Lower Cretaceous vertebrate-bearing deposits in the Atlantic coastal plain. Vertebrate fossils from this unit have been known for more than 150 years, but thus far formal descriptions have mainly concentrated on its dinosaurs and mammals. Herein, we eport on a moderately diverse faunal assemblage (USNM 41614) from Dinosaur Park in Prince Georges County, Maryland. This assemblage is represented by 306 disarticulated macroand microfossils that largely consist of teeth and scales (89%). This vertebrate fauna includes two species of hybodont sharks, multiple semionotid fishes, one species of lungfish, three species of turtle, three families of neosuchian crocodilians, six species of dinosaurs, and two species of mammals. Combined with other historical collections from this unit, these new additions to the fauna show that the Arundel was a far more robust and diverse ecosystem than previously envisaged, broadly similar in composition to contemporaneous units of western North America. The Arundel assemblage differs, however, from those in many other Lower Cretaceous sites in that it is dominated numerically by Hybodus and goniopholidid crocodylomorphs, which together comprise 58% of catalogued specimens. Similarly, this sample entirely lacks lissamphibians and lepidosaurs. Traditionally, the Arundel has been interpreted as being of fluvial origin, deposited in a freshwater system of stranded channels or oxbows. Based on faunal composition, together with published geological and sedimentological evidence, we propose that at least some of the Arundel facies was deposited in close proximity to the Atlantic Ocean. Joseph A. Frederickson. Sam Noble Museum, 2401 Chautauqua Avenue, Norman, Oklahoma, 73072, USA and Department of Biology, University of Oklahoma, Norman, Oklahoma, 73019, USA. joe.frederickson@swosu.edu Thomas R. Lipka. Sam Noble Museum, 2401 Chautauqua Avenue, Norman, Oklahoma, 73072, USA thomas.r.lipka-1@ou.edu Richard L. Cifelli. Sam Noble Museum, 2401 Chautauqua Avenue, Norman, Oklahoma, 73072, USA and Department of Biology, University of Oklahoma, Norman, Oklahoma, 73019, USA. rlc@ou.edu

Faunal composition and paleoenvironment of the Arundel Clay (Potomac Formation; Early Cretaceous), Maryland, USA