Mud Cliffs, East of (Miocene of the United States)

Where: Westmoreland County, Virginia (38.2° N, 76.8° W: paleocoordinates 38.4° N, 73.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Choptank Formation (Chesapeake Group), Serravallian (13.8 - 11.6 Ma)

• three feet ten inches below zone 17 shell bed

•The Choptank Formation as a whole falls into dinoflagellate zone DN6 [94], which in turn partially correlates with foraminiferal zones N10–11 (14.2–13.4 Ma [20]) and nannoplankton zone NN6 (13.5–11.9 Ma [20]) [94]. The overlap of these zones defines a narrow age range of 13.5–13.4 Ma, which fits well with strontium dates of ca. 13 Ma [48, 49], and the 13.9–13.8 Ma expansion of the East Antarctic Ice Sheet interpreted to mark the transition between the Calvert and Choptank formations [49]. (Marx & Fordyce, 2015)

Environment/lithology: offshore shelf; green, sandy siltstone

• The Choptank Formation exhibits an offshore middle neritic environment. It is shallow and open-shelf.
• greenish sandy silt

Size class: macrofossils

Collection methods: surface (float),

Primary reference: R. Kellogg. 1969. Cetothere skeletons from the Miocene Choptank Formation of Maryland and Virginia. Bulletin - U.S. National Museum 294:1-40 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 13407: authorized by Mark Uhen, entered by Mark Uhen on 14.03.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

 Cetacea -
Thinocetus arthritus n. gen. n. sp.
Thinocetus arthritus n. gen. n. sp. Kellogg 1969 whale
 Pectinida - Pectinoidae
"Pecten madisonius" = Chesapecten madisonius Say 1824 scallop
 Carditida - Crassatellidae
"Crassatella turgidula" = Marvacrassatella turgidula
"Crassatella turgidula" = Marvacrassatella turgidula Conrad 1843 clam
 Neogastropoda - Muricidae
Ecphora quadricostata Conrad 1830 murex snail