Governor Run, Zone 14 (Miocene of the United States)

Also known as Kenwood Beach

Where: Calvert County, Maryland (38.5° N, 76.5° W: paleocoordinates 38.7° N, 73.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Calvert Beach Member (Calvert Formation), Serravallian (13.8 - 11.6 Ma)

• Zones 14-16A are regarded as Serravallian in age.

• bed-level stratigraphic resolution

Environment/lithology: foreshore; brown, sandy claystone

• sparse molluscs, low in diversity; subtropical environment in embayment and dry onshore; area not far from shore, bay, short-term eustatic transgression events, long-term regression trend
• brownish sandy clay

Size class: macrofossils

Primary reference: F. G. Marx and R. E. Fordyce. 2015. Baleen boom and bust: a synthesis of mysticete phylogeny, diversity and disparity. Royal Society Open Science 2:140434 [M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 70835: authorized by Mark Uhen, entered by Mark Uhen on 09.04.2007, edited by Evangelos Vlachos and Margot Nelson

Creative Commons license: CC BY (attribution)

Taxonomic list

Aves
 Anseriformes - Anatidae
 Charadriiformes - Alcoidae
Miocepphus mcclungi7 Wetmore 1940 auk
Reptilia
 Testudines - Cheloniidae
Procolpochelys grandaeva6 Leidy 1861 sea turtle
Basicranium (USNM 186969) consisting of right quadrate, right opisthotic, parts of right and left parietals, supraoccipital, basioccipital, and left exoccipital, collected by D. B. Mackie
Mammalia
 Carnivora - Phocidae
? Leptophoca sp.5, "Leptophoca lenis" = Leptophoca proxima5
? Leptophoca sp.5 True 1906 seal
"Leptophoca lenis" = Leptophoca proxima5 Van Beneden 1876 seal
 Cetacea -
Pelodelphis gracilis n. gen. n. sp.3 Kellogg 1955 toothed whale
Hadrodelphis calvertense5 Kellogg 1966 toothed whale
 Cetacea - Kentriodontidae
Kentriodon pernix2 Kellogg 1927 toothed whale
 Cetacea - Eurhinodelphinidae
"Eurhinodelphis cristatus" = Xiphiacetus cristatus5, Schizodelphis barnesi2
"Eurhinodelphis cristatus" = Xiphiacetus cristatus5 Du Bus 1872 toothed whale
Schizodelphis barnesi2 Myrick 1979 toothed whale
 Cetacea -
"Aglaocetus patulus" = Atlanticetus patulus5, Diorocetus hiatus5
"Aglaocetus patulus" = Atlanticetus patulus5 Kellogg 1968 whale
Diorocetus hiatus5 Kellogg 1968 whale
 Cetacea - Tranatocetidae
Mesocetus siphunculus5 Cope 1895 whale
Chondrichthyes
 Lamniformes - Otodontidae
"Carcharodon megalodon" = Otodus megalodon5
"Carcharodon megalodon" = Otodus megalodon5 Agassiz 1835 megalodon
Also studied in Pimiento et al. 2010
Bivalvia
 Cardiida - Glossidae
"Isocardia fraterna" = Glossus fraterna4
"Isocardia fraterna" = Glossus fraterna4 Say 1824 clam