Plum Point, south, Zone 10 (Miocene of the United States)

Where: Calvert County, Maryland (38.6° N, 76.5° W)

• Paleocoordinates: 40.3° N, 69.4° W (Wright 2013)

• coordinate estimated from map

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

• Strontium dating indicates the age of bed 10 to be 16.2–15.8 Ma, or possibly somewhat older (16.4 Ma) [48, 49]. (Marx & Fordyce, 2015)

• bed-level stratigraphic resolution

Environment/lithology: estuary or bay; sandstone

• 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

Size class: macrofossils

Preservation: original phosphate

Reposited in the USNM

Collection methods: surface (in situ),

Primary reference: C. R. Eastman. 1904. Systematic Paleontology: Pisces. Maryland Geological Survey Miocene, Text 71-93 [M. Uhen/M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 48884: authorized by Mark Uhen, entered by Mark Uhen on 03.04.2005, edited by Margot Nelson

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Chondrichthyes
 Lamniformes - Mitsukurinidae
"Odontaspis elegans" = Striatolamia macrota
"Odontaspis elegans" = Striatolamia macrota Agassiz 1838 goblin shark
 Lamniformes - Carchariidae
Carcharias collata n. sp.
Carcharias collata n. sp. Eastman 1904 sand shark
 Lamniformes - Otodontidae
"Carcharodon megalodon" = Otodus megalodon
"Carcharodon megalodon" = Otodus megalodon Agassiz 1835 megalodon
Also studied in Pimiento et al. 2010
 Lamniformes - Odontaspididae
"Odontaspis cuspidata" = Araloselachus cuspidatus8
"Odontaspis cuspidata" = Araloselachus cuspidatus8 Agassiz 1843 sand tiger shark
 Lamniformes - Lamnidae
"Oxyrhina hastalis" = Carcharodon hastalis, "Oxyrhina sillimani" = Isurus sillimanii, "Oxyrhina desorii" = Isurus oxyrinchus
"Oxyrhina hastalis" = Carcharodon hastalis Agassiz 1838 white shark
"Oxyrhina sillimani" = Isurus sillimanii Gibbes 1847 mackerel shark
"Oxyrhina desorii" = Isurus oxyrinchus Rafinesque 1810 mackerel shark
 Carcharhiniformes - Galeocerdidae
"Galeocerdo contortus" = Physogaleus contortus8
"Galeocerdo contortus" = Physogaleus contortus8 Gibbes 1847 ground shark
 Carcharhiniformes - Hemigaleidae
Hemipristis serra8
Hemipristis serra8 Agassiz 1835 ground shark
 Squatiniformes - Squatinidae
Squatina occidentalis n. sp.
Squatina occidentalis n. sp. Eastman 1904 angel shark
Reptilia
 Testudines -
"Chelonia indet." = Testudines8
"Chelonia indet." = Testudines8 Batsch 1788 turtle
Mammalia
 Carnivora - Amphicyonidae
Amphicyon sp.8
Amphicyon sp.8 Lartet 1836 bear-dog
 Carnivora - Canidae
"Tomarctus marylandica n. sp." = Cynarctus marylandica1
"Tomarctus marylandica n. sp." = Cynarctus marylandica1 Berry 1938 bone-crushing dog
 Perissodactyla - Equidae
Archaeohippus sp.3
Archaeohippus sp.3 Gidley 1906 anchitheriine horse
 Artiodactyla - Tayassuidae
Desmathyus sp.8
Desmathyus sp.8 Matthew 1907 peccary
 Cetacea -
Siphonocetus priscus8, Parietobalaena palmeri8
Siphonocetus priscus8 Leidy 1851 whale
Parietobalaena palmeri8 Kellogg 1924 whale
 Cetacea - Kentriodontidae
Kentriodon pernix8
Kentriodon pernix8 Kellogg 1927 toothed whale
 Cetacea - Platanistidae
Zarhachis sp.8
Zarhachis sp.8 Cope 1868 toothed whale
 Cetacea - Physeteridae
Physeterula sp.8, Orycterocetus crocodilinus8
Physeterula sp.8 Van Beneden 1877 sperm whale
Orycterocetus crocodilinus8 Cope 1867 sperm whale
 Cetacea - Eurhinodelphinidae
"Eurhinodelphis bossi" = Xiphiacetus bossi8, "Eurhinodelphis vaughni" = Xiphiacetus bossi8, Schizodelphis sulcatus7, Schizodelphis morckhoviensis5, Schizodelphis barnesi7, Eurhinodelphis sp.8
"Eurhinodelphis bossi" = Xiphiacetus bossi8 Kellogg 1925 toothed whale
"Eurhinodelphis vaughni" = Xiphiacetus bossi8 Kellogg 1925 toothed whale
Schizodelphis sulcatus7 Gervais 1853 toothed whale
Schizodelphis morckhoviensis5 Du Bus 1872 toothed whale
Schizodelphis barnesi7 Myrick 1979 toothed whale
Eurhinodelphis sp.8 Van Beneden and Gervais 1880 toothed whale
 Sirenia - Dugongidae
? Nanosiren sp.2, "Metaxytherium calvertense n. sp." = Metaxytherium crataegense6
? Nanosiren sp.2 Domning and Aguilera 2008 dugong
"Metaxytherium calvertense n. sp." = Metaxytherium crataegense6 Simpson 1932 dugong
Actinopteri
 Tetraodontiformes - Molidae
Ranzania sp.8
Ranzania sp.8 Nardo 1840
Bivalvia
 Carditida - Astartidae
Astarte cuneiformis8
Astarte cuneiformis8 Conrad 1840 clam
Foraminifera
 Globigerinoidea - Globigerinidae
Praeorbulina glomerosa4, Globigerina praebulloides pseudociperoensis4, Globigerinoides altiaperturus4, "Globigerinoides sicanus" = Trilobatus sicanus4, Globoquadrina altispira altispira4
"Globigerinoides sicanus" = Trilobatus sicanus4 De Stefani 1950
1Berry 1938; 2Domning and Aguilera 2008; 3Gazin and Collins 1950; 4Gibson 1983; 5Godfrey and Lambert 2023; 6Kellogg 1966; 7Muizon 1988; 8Uhen 2007