Governor Run, north of, Zone 13 (Miocene of the United States)

Where: Calvert County, Maryland (38.5° N, 76.5° W: paleocoordinates 38.7° N, 73.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Plum Point Member (Calvert Formation), Langhian (16.0 - 13.8 Ma)

• three feet below top of Zone 13; 14.8-14.9 AEO date

• bed-level stratigraphic resolution

Environment/lithology: estuary or bay; sandy claystone

• sparse molluscs, low in diversity; subtropical environment in embayment and dry onshore; area not far from shore, quiet water, soft bottom;embayment, short-term eustatic transgression events, long-term regression trend
• no lithological description given

Size class: macrofossils

Preservation: original phosphate

Reposited in the USNM

Collection methods: surface (in situ),

Primary reference: E. C. Case. 1904. Systematic Paleontology: Mammalia. Maryland Geological Survey Miocene: Text 1-58 [M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 45502: authorized by Mark Uhen, entered by Mark Uhen on 26.10.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Rotaliina
 Nonionacea - Nonionidae
Gastropoda
 Neogastropoda - Muricidae
Ecphora (Ecphora) turneri7 Petuch 1992 murex snail
Petuch states that this species is from Plum Point Marl, Zone 14, but Plum Point only extends to Zone 13
Mammalia
 Proboscidea - Gomphotheriidae
"Gomphotherium calvertensis n. sp." = Gomphotherium obscurum1
"Gomphotherium calvertensis n. sp." = Gomphotherium obscurum1 Leidy 1869 gomphothere
 Cetacea -
Diorocetus hiatus6 Kellogg 1968 whale
Pelocetus calvertensis n. gen. n. sp.4 Kellogg 1965 whale
 Cetacea - Platanistidae
"Priscodelphinus crassangulum n. sp." = Zarhachis crassangulum, "Schizodelphis crassangulum" = Zarhachis crassangulum8
"Priscodelphinus crassangulum n. sp." = Zarhachis crassangulum Case 1904 toothed whale
"Schizodelphis crassangulum" = Zarhachis crassangulum8 Case 1904 toothed whale
True (1908, p. 456) states that one piece of the type specimen of Priscodelphinus crassangulum is actually the basisphenoid of a species of Mesoplodon
 Cetacea -
Pelodelphis gracilis3, "Lophocetus pappus" = Liolithax pappus3, Hadrodelphis calvertense n. gen. n. sp.5
Pelodelphis gracilis3 Kellogg 1955 toothed whale
"Lophocetus pappus" = Liolithax pappus3 Kellogg 1955 toothed whale
Hadrodelphis calvertense n. gen. n. sp.5 Kellogg 1966 toothed whale