Hellen Creek, Zone 20 (Miocene of the United States)
Where: Calvert County, Maryland (38.4° N, 76.5° W: paleocoordinates 38.5° N, 73.6° W)
• coordinate estimated from map
When: Conoy Member (Choptank Formation), Serravallian (13.8 - 11.6 Ma)
Environment/lithology: marine; fine-grained, argillaceous, sandy siltstone
• Silt; clayey, slightly sandy, blocky, laminated with thin sand partings
Primary reference: L. W. Ward. 1992. Molluscan biostratigraphy of the Miocene Middle Atlantic Coastal Plain of North America. Virginia Museum of Natural History 2 [A. Miller/A. Hendy]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 71639: authorized by Mark Uhen, entered by Mark Uhen on 02.05.2007
Creative Commons license: CC BY (attribution)
Taxonomic list
Show authors, comments, and common names
Bivalvia | |
Mercenaria cuneata Conrad 1869 quahog | |
Gastropoda | |
"Turritella plebeia" = Mariacolpus plebeia
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