Upper Oso Dam: Langhian, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Lagomorpha - Leporidae
Archaeolagus sp. Dice 1917
Whistler and Lander 2003
Mammalia - Rodentia - Cricetidae
Leidymys sp. Wood 1936
Whistler and Lander 2003
(small)
Mammalia - Carnivora - Odobenidae
Neotherium sp. Kellogg 1931
    = aff. Neotherium sp. Kellogg 1931
Velez-Juarbe 2017
Mammalia - Carnivora - Otariidae
Otariidae indet. (Gray 1825)
Eotaria citrica n. sp. Velez-Juarbe 2017
Velez-Juarbe 2017 1 specimen
Mammalia - Carnivora - Desmatophocidae
Allodesmus sp. Kellogg 1922
Mammalia - Perissodactyla - Equidae
Merychippus sp. Leidy 1856
    = Equinae indet. Steinmann and Döderlein 1890
Alroy 2002
Mammalia - Perissodactyla
Desmostylia indet. Reinhart 1953
Velez-Juarbe 2017
Mammalia - Cetacea - Allodelphinidae
"Squalodon" errabundus Kellogg 1931
recombined as Zarhinocetus errabundus
Mammalia - Cetacea - Kentriodontidae
Kentriodon sp. Kellogg 1927
    = Kentriodon aff. obscurus Kellogg 1931
Velez-Juarbe 2017
Mammalia - Cetacea - Cetotheriidae
Cetotheriidae indet. (Brandt 1872)
Velez-Juarbe 2017
Mammalia - Palaeomerycidae
Palaeomerycidae indet. Lydekker 1883
"large"
Mammalia - Camelidae
Aepycamelus sp. Macdonald 1956
Reptilia - Charadriiformes
Panalcidae indet. Smith 2011
Kloess and Parham 2017 3 specimens
Alcodes aff. ulnulus Howard 1968
nomen dubium belonging to Panalcidae
Reptilia - Procellariidae
Puffinus sp. Brisson 1760
new species?
Puffinus ? mitchelli Miller 1961
Kloess and Parham 2017
Puffinus priscus Miller 1961
Puffinus cf. priscus Miller 1961
Kloess and Parham 2017
Reptilia - Diomedeidae
Diomedea sp. Linnaeus 1758
Kloess and Parham 2017 1 specimen
Diomedea ? milleri Howard 1966
Reptilia - Suliformes - Sulidae
Sulidae sp. Reichenbach 1849
spp.
Sulidae indet. Reichenbach 1849
Kloess and Parham 2017 11 specimens
Sula ? willetti Miller 1925
Kloess and Parham 2017
Reptilia - Anseriformes - Anatidae
Anatinae indet. Vigors 1825
Velez-Juarbe 2017
Mergini indet. Bonaparte 1838
Chondrichthyes - Carcharhiniformes - Galeocerdidae
Galeocerdo aduncus (Agassiz 1835)
Chondrichthyes - Carcharhiniformes - Hemigaleidae
Hemipristis serra Agassiz 1835
Chondrichthyes - Carcharhiniformes - Carcharhinidae
Carcharhinus sp. de Blainville 1816
Negaprion sp. Whitley 1940
Chondrichthyes - Lamniformes - Otodontidae
Procarcharodon megalodon (Agassiz 1835)
recombined as Otodus megalodon
Chondrichthyes - Lamniformes - Lamnidae
Isurus sp. Rafinesque 1810
spp.
Isurus planus (Agassiz 1856)
Isurus hastalis (Agassiz 1838)
recombined as Carcharodon hastalis
Chondrichthyes - Squalidae
Squalus sericulus
Chondrichthyes - Squatinidae
Squatina lerichei Jordan and Beal 1910
Chondrichthyes - Myliobatiformes - Myliobatidae
Myliobatis sp. Cuvier 1816
see common names

Geography
Country:United States State/province:California County:Orange
Coordinates: 33.7° North, 117.6° West (view map)
Paleocoordinates:32.9° North, 113.0° West
Basis of coordinate:estimated from map
Geographic resolution:local area
Time
Period:Neogene Epoch:Miocene
Stage:Langhian 10 m.y. bin:Cenozoic 5
*Period:Tertiary
Key time interval:Langhian
Age range of interval:15.98000 - 13.82000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:"Topanga"
Stratigraphic resolution:group of beds
Stratigraphy comments: 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
Lithology and environment
Primary lithology:coarse,pebbly,gray,yellow sandstone
Includes fossils?Y
Lithology description: gray and yellowish-red colored, pebble-bearing, coarse sand deposit
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:general faunal/floral analysis
Museum repositories:LACM
Metadata
Also known as:LACM 4464, LACM 4546, 4547, 4961
Database number:19595
Authorizer:J. Alroy, M. Uhen, J. Marcot Enterer:J. Alroy, M. Uhen, J. Marcot
Modifier:J. Marcot Research group:vertebrate
Created:1995-03-26 00:00:00 Last modified:2023-10-14 23:58:52
Access level:the public Released:1995-03-26 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
1946. 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]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
48954 P. A. Kloess and J. F. Parham. 2017. A specimen-based approach to reconstructing the late Neogene seabird communities of California. Palaeogeography, Palaeoclimatology, Palaeoecology 468:473-484 [M. Uhen/H. Reyes/M. Uhen]
61789 J. Velez-Juarbe. 2017. Eotaria citrica, sp. nov., a new stem otariid from the “Topanga” formation of Southern California. PeerJ 5:e3022 [M. Uhen/M. Uhen]
54866 D. P. Whistler and E. B. Lander. 2003. New Late Uintan to Early Hemingfordian Land Mammal Assemblages from the Undifferentiated Sespe and Vaqueros Formations, Orange County, and from the Sespe and Equivalent Marine Formations in Los Angeles, Santa Barbara, and Ventura Counties, Southern California. Bulletin of the American Museum of Natural History 279:231-268 [J. Marcot/J. Marcot]