Severn Formation
Introduction The '''Severn Formation''' is a Mesozoic geologic formation in Maryland. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.
Paleofauna === Dinosaurs ===* ''"Coelosaurus" antiquus''* Ornithomimidae indet. *Hadrosauridae indet.=== Plesiosaurs ===* ''Cimoliasaurus magnus''=== Mosasaurs ===* ''Halisaurus platyspondylus''* ''Prognathodon rapax''* ''Mosasaurus hoffmanni''* ''Mosasaurus sp''. * cf. ''Mosasaurus conodon''* Mosasauridae indet.=== Crocodylomorphs ===* ''Deinosuchus rugosus''* ''Thoracosaurus neocesariensis''* Alligatorinae indet.=== Turtles ===* ''Peritresius ornatus''* ''Osteopygis emarginatus''* ''Trionyx priscus''* Toxochelyidae indet.=== Chondrichthyans ===* ''Carcharias holmdelensis''* ''Carcharias samhammeri''* ''Chiloscyllium greeni''* ''Cretalamana appendiculata''* ''Dasyatis sp. ''* ''Tomewingia problematica''* ''Galeorhinus garadoti''* ''Ginglymostoma sp. ''* ''Heterodontus sp. ''* ''Hybodus sp. ''* ''Ischyrhiza cf. avonicola''* ''Ischyrhiza mira''* ''Myliobatis sp. ''* ''Odontaspis aculeatus''* ''Plicatoscyllium antiquum''* ''Plicatoscyllium derameei''* ''Pseudohypolophus mcnultyi''* ''Ptychotrygon vermiculata''* ''Raja farishi''* ''Rhinobatos sp. ''* ''Rhombodus binkhorsti''* ''Serratolamna serrata''* ''Squalicorax kaupi''* ''Squalicorax pristodontus''* ''Squatina hassei''* ''Ischyodus sp. ''=== Osteichthyans ===* Albuidae indet. * ''Anomoedus cf. haseolus''* ''Cylinadracanthus sp. ''* ''Egertonia sp. ''* ''Enchodus ferox''* ''Hadrodus sp. ''* ''Lepidosteus sp. ''* ''Paralbula casei''
See also * List of dinosaur-bearing rock formations** List of stratigraphic units with few dinosaur genera
Footnotes
References * Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds. ): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. .