Upper Oso Dam (Miocene of the United States)

Also known as LACM 4464, LACM 4546, 4547, 4961

Where: Orange County, California (33.7° N, 117.6° W: paleocoordinates 32.9° N, 113.0° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Topanga Formation, Langhian (16.0 - 13.8 Ma)

• Howard and Barnes (1987) state that these deposits had been previously called the Topanga Formation, but that the name Topanga Formation is no longer used in this area, but no new formation name has been applied to these deposits.

•correlated with the Sharktooth Hill Local Fauna; Barstovian NALMA

• group of beds-level stratigraphic resolution

Environment/lithology: marine; coarse-grained, pebbly, gray, yellow sandstone

• gray and yellowish-red colored, pebble-bearing, coarse sand deposit

Size class: macrofossils

Primary reference: H. Howard and L. G. Barnes. 1987. Middle Miocene marine birds from the foothills of the Santa Ana Mountains, Orange County, California. Contributions in Science, Natural History Museum of Los Angeles County 383:1-9 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 19595: authorized by John Alroy, entered by John Alroy on 26.03.1995, edited by Mark Uhen and Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

 Squatiniformes - Squatinidae
Squatina lerichei Jordan and Beal 1910 angel shark
 Odontaspidida - Carcharodontidae
"Isurus hastalis" = Cosmopolitodus hastalis
"Isurus hastalis" = Cosmopolitodus hastalis Agassiz 1843 elasmobranch
 Plagiostomi - Squalidae
Squalus sericulus dogfish shark
 Myliobatiformes - Myliobatidae
Myliobatis sp. Cuvier 1816 eagle ray
 Lamniformes - Otodontidae
"Procarcharodon megalodon" = Otodus megalodon
"Procarcharodon megalodon" = Otodus megalodon Agassiz 1843 megalodon
 Lamniformes - Lamnidae
Isurus sp. Agassiz 1843 mako shark
Isurus planus Agassiz 1856 mako shark
 Carchariniformes - Carcharhinidae
Negaprion sp. Whitley 1940 lemon shark
Galeocerdo aduncus Agassiz 1843 tiger shark
 Carchariniformes - Hemigaleidae
"Hemipristis serra" = Hemipristis heteropleurus
"Hemipristis serra" = Hemipristis heteropleurus Agassiz 1844 ground shark
 Charadriiformes - Panalcidae
Panalcidae indet.2 Smith 2011 shorebird
Alcodes aff. ulnulus Howard 1968 shorebird
 Anseriformes - Anatidae
Anatinae indet.3 Vigors 1825 duck
 Procellariiformes - Diomedeidae
Diomedea sp.2 Linnaeus 1758 albatross
Diomedea ? milleri Howard 1966 albatross
 Procellariiformes - Procellariidae
Puffinus sp. Brisson 1760 shearwater
new species?
Puffinus ? mitchelli2 Miller 1961 shearwater
Puffinus priscus Miller 1961 shearwater
Puffinus cf. priscus2 Miller 1961 shearwater
 Suliformes - Sulidae
Sulidae sp. Reichenbach 1849 booby
Sulidae indet.2 Reichenbach 1849 booby
Sula ? willetti2 Miller 1925 booby
 Rodentia - Cricetidae
Leidymys sp.4 Wood 1936 mouse
 Lagomorpha - Leporidae
Archaeolagus sp.4 Dice 1917 rabbit
 Perissodactyla - Equidae
Equinae indet.1 Steinmann and Döderlein 1890 horse
 Carnivora - Odobenidae
aff. Neotherium sp.3 Kellogg 1931 walrus
 Carnivora - Otariidae
Otariidae indet. eared seal
Eotaria citrica n. sp.3 Velez-Juarbe 2017 eared seal
 Carnivora - Desmatophocidae
Allodesmus sp. Kellogg 1922 pinniped
 Ungulata - Camelidae
Aepycamelus sp. Macdonald 1956 camel
 Cetacea - Cetotheriidae
Cetotheriidae indet.3 Brandt 1872 whale
 Cetacea - Allodelphinidae
""Squalodon" errabundus" = Zarhinocetus errabundus
""Squalodon" errabundus" = Zarhinocetus errabundus Kellogg 1931 toothed whale
 Cetacea - Kentriodontidae
Kentriodon aff. obscurus3 Kellogg 1931 toothed whale