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

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

• Paleocoordinates: 40.2° N, 69.4° W (Wright 2013)

• 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: CC0 (CC0)

Taxonomic list

Globothalamea
 Rotaliida - 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
 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, Diorocetus hiatus6, Pelocetus calvertensis n. gen. n. sp.4
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
Diorocetus hiatus6 Kellogg 1968 whale
Pelocetus calvertensis n. gen. n. sp.4 Kellogg 1965 whale
 Proboscidea - Mammutidae
"Gomphotherium calvertensis n. sp." = Gomphotherium obscurum1
"Gomphotherium calvertensis n. sp." = Gomphotherium obscurum1 Leidy 1869 mastodon