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

Where: Calvert County, Maryland (38.6° N, 76.5° W: paleocoordinates 38.8° N, 73.2° W)

• 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: CC BY (attribution)

Taxonomic list

Foraminifera
 Globigerinoidea - Globigerinidae
Globoquadrina altispira4 Cushman and Jarvis 1936
subspecies altispira
Globigerina praebulloides4 Blow 1959
subspecies pseudociperoensis
"Globigerinoides sicanus" = Trilobatus sicanus4 de Stefani 1950
Bivalvia
 Carditida - Astartidae
Astarte cuneiformis8 Conrad 1840 clam
Chondrichthyes
 Squatiniformes - Squatinidae
Squatina occidentalis n. sp. Eastman 1904 angel shark
 Carcharhiniformes - Carcharhinidae
"Galeocerdo contortus" = Physogaleus contortus8
"Galeocerdo contortus" = Physogaleus contortus8 Gibbes 1847 requiem shark
 Carcharhiniformes - Hemigaleidae
Hemipristis serra8 Agassiz 1835 ground shark
 Lamniformes - Odontaspididae
"Odontaspis cuspidata" = Araloselachus cuspidatus8
"Odontaspis cuspidata" = Araloselachus cuspidatus8 Agassiz 1843 sand tiger shark
 Lamniformes - Carchariidae
Carcharias collata n. sp. Eastman 1904 sand shark
 Lamniformes - Lamnidae
"Oxyrhina desorii" = Isurus oxyrinchus, "Oxyrhina sillimani" = Isurus sillimanii, "Oxyrhina hastalis" = Carcharodon hastalis
"Oxyrhina desorii" = Isurus oxyrinchus Rafinesque 1810 mackerel shark
"Oxyrhina sillimani" = Isurus sillimanii Gibbes 1847 mackerel shark
"Oxyrhina hastalis" = Carcharodon hastalis Agassiz 1838 white shark
 Lamniformes - Mitsukurinidae
"Odontaspis elegans" = Striatolamia macrota
"Odontaspis elegans" = Striatolamia macrota Agassiz 1838 goblin shark
 Lamniformes - Otodontidae
"Carcharodon megalodon" = Otodus megalodon
"Carcharodon megalodon" = Otodus megalodon Agassiz 1835 megalodon
Also studied in Pimiento et al. 2010
Mammalia
 Perissodactyla - Equidae
Archaeohippus sp.3 Gidley 1906 anchitheriine horse
 Artiodactyla - Tayassuidae
Desmathyus sp.8 Matthew 1907 peccary
 Cetacea - Platanistidae
Zarhachis sp.8 Cope 1868 toothed whale
 Cetacea - Physeteridae
Physeterula sp.8 Van Beneden 1877 sperm whale
Orycterocetus crocodilinus8 Cope 1867 sperm whale
 Cetacea - Eurhinodelphinidae
Schizodelphis barnesi7 Myrick 1979 toothed whale
Schizodelphis sulcatus7 Gervais 1853 toothed whale
Schizodelphis morckhoviensis5 Du Bus 1872 toothed whale
"Eurhinodelphis bossi" = Xiphiacetus bossi8 Kellogg 1925 toothed whale
"Eurhinodelphis vaughni" = Xiphiacetus bossi8 Kellogg 1925 toothed whale
Eurhinodelphis sp.8 Van Beneden and Gervais 1880 toothed whale
 Cetacea - Kentriodontidae
Kentriodon pernix8 Kellogg 1927 toothed whale
 Cetacea -
Parietobalaena palmeri8 Kellogg 1924 whale
Siphonocetus priscus8 Leidy 1851 whale
 Carnivora - Amphicyonidae
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
 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
Reptilia
 Testudines -
"Chelonia indet." = Testudines8
"Chelonia indet." = Testudines8 Batsch 1788 turtle
Actinopteri
 Tetraodontiformes - Molidae
Ranzania sp.8 Nardo 1840