Laguna Niguel: Tortonian - Messinian, California

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Smilodonicthyes rastrosus
Barnes et al. 1985
Paralichthyes sp.
Barnes et al. 1985
Artiodactyla indet.
Barnes et al. 1985
? Aethia sp.
Howard 1978
Chondrichthyes - Odontaspidida - Carcharodontidae
Isurus hastalis (Agassiz 1843)
Barnes et al. 1985
recombined as Cosmopolitodus hastalis
Chondrichthyes - Myliobatiformes - Myliobatidae
Myliobatidae indet. Bonaparte 1838
Barnes et al. 1985
Chondrichthyes - Lamniformes - Otodontidae
Carcharodon megalodon (Agassiz 1843)
Barnes et al. 1985
recombined as Otodus megalodon
Chondrichthyes - Carchariniformes - Sphyrnidae
Sphyrna sp. Rafinesque 1810
Barnes et al. 1985
Chondrichthyes - Squalomorphii - Hexanchidae
Hexanchus sp. Rafinesque 1810
Barnes et al. 1985
Actinopteri - Carangiformes - Carangidae
Carangidae indet. Rafinesque 1815
Barnes et al. 1985
Actinopteri - Scombriformes - Scombridae
Scombridae indet. (Rafinesque 1815)
Barnes et al. 1985
Actinopteri - Perciformes - Serranidae
Serranidae spp.
Barnes et al. 1985
Epinephelus sp. Bloch 1793
Barnes et al. 1985
Actinopteri - Sciaenidae
Sciaenidae indet. (Cuvier 1828)
Barnes et al. 1985
original and current combination Sciaenoidei
Actinopteri - Labriformes - Labridae
Pimelometopon sp. Gill 1864
Barnes et al. 1985
synonym of Semicossyphus
Salientia
Anura indet. (Fischer von Waldheim 1813)
Barnes et al. 1985
Reptilia - Testudines
aff. Dermochelys sp. de Blainville 1816
Barnes et al. 1985
Reptilia - Avetheropoda - Alcidae
Praemancalla wetmorei n. sp. Howard 1976
6 specimens
recombined as Miomancalla wetmorei
Fraterculini indet. Storer 1960
Howard 1978
? Cepphus sp. Moehring 1758
Howard 1978
? Uria sp. Brisson 1760
Howard 1978
Reptilia - Avetheropoda - Pelagornithidae
Osteodontornis orri Howard 1957
Howard 1978
Reptilia - Avetheropoda - Gaviidae
Gavia brodkorbi n. sp. Howard 1978
Howard 1978
Reptilia - Avetheropoda - Hydrobatidae
Oceanodroma sp. Reichenbach 1950
Howard 1978
Reptilia - Avetheropoda - Diomedeidae
Diomedea sp. Linnaeus 1758
Howard 1978
Diomedea ? californica Miller 1962
Howard 1978
synonym of Phoebastria anglica
Reptilia - Avetheropoda - Procellariidae
Puffinus barnesi n. sp. Howard 1978
Howard 1978
Reptilia - Avetheropoda - Sulidae
Sulidae indet. Reichenbach 1849
Howard 1978
? Miosula media Miller 1925
Howard 1978
Morus magnus n. sp. Howard 1978
Howard 1978
Morus lompocanus (Miller 1925)
Howard 1978
Mammalia - Dugongidae
Dusisiren cf. jordani (Kellogg 1925)
Barnes et al. 1985
Mammalia - Carnivora - Odobenidae
Odobenidae indet. (Allen 1880)
Velez-Juarbe and Valenzuela-Toro 2019
cf. Pontolis sp. True 1905
Barnes et al. 1985
new species
Imagotaria downsi Mitchell 1968
Barnes et al. 1985
    = Imagotaria cf. downsi Mitchell 1968
Velez-Juarbe and Valenzuela-Toro 2019
Mammalia - Carnivora - Otariidae
Otariidae indet. (Gray 1825)
Barnes et al. 1985
Pithanotaria starri Kellogg 1925
Barnes et al. 1985
Mammalia - Carnivora - Phocidae
Monachinae indet. Trouessart 1897
Velez-Juarbe and Valenzuela-Toro 2019
Mammalia - Cetacea - Balaenopteridae
Balaenopteridae indet. Gray 1864
Barnes et al. 1985
small and large rorquals
Mammalia - Cetacea - Cetotheriidae
Cetotheriidae indet. (Brandt 1872)
Barnes et al. 1985
large cetothere
    = Herpetocetinae indet. Steeman 2007
Velez-Juarbe and Valenzuela-Toro 2019
Herpetocetinae indet. Steeman 2007
Velez-Juarbe and Valenzuela-Toro 2019
? Nannocetus sp. Kellogg 1929
Barnes et al. 1985
Mammalia - Cetacea - Monodontidae
Delphinapterinae indet. Gill 1871
Barnes et al. 1985
Mammalia - Cetacea - Phocoenidae
Piscolithax sp. Muizon 1983
Barnes et al. 1985
    = Piscolithax cf. tedfordi Barnes 1984
Velez-Juarbe and Valenzuela-Toro 2019
Mammalia - Cetacea
Pithanodelphis sp. Abel 1905
Barnes et al. 1985
new species
Atocetus nasalis (Barnes 1985)
Velez-Juarbe and Valenzuela-Toro 2019
see common names

Geography
Country:United States State/province:California County:Orange
Coordinates: 33.6° North, 117.7° West (view map)
Paleocoordinates:33.1° North, 115.2° West
Basis of coordinate:stated in text
Geographic resolution:local area
Time
Period:Neogene Epoch:Miocene
10 m.y. bin:Cenozoic 6
*Period:Late/Upper Tertiary *Epoch:Late/Upper Miocene
Key time interval:Tortonian - Messinian
Age range of interval:11.62000 - 5.33300 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Monterey
Stratigraphic resolution:formation
Stratigraphy comments: Domning (1978) indicates this collection is latest Miocene-early Pliocene, but Barnes et al., 1985 state it is approximately 10 Ma.

In Southern California the Monterey Formation ranges from the mid Langhian to earliest Messinian (14.9 – 7.1 Ma) [16–18]. Microfossils (diatoms and silicoflagellates) recovered from LACM Loc. 6901, a diatomaceous unit that is stratigraphically below Loc. 6902 [11], are part of the lower Thalassiosira antiqua Subzone a, which ranges from 8.5 to 7.7 Ma [18]. This gives LACM Loc. 6902 an age between 8.5 and 7.1 Ma (late Tortonian–earliest Messinian [19]) (Velez-Juarbe & Valenzuela-Toro, 2019).
Lithology and environment
Primary lithology:yellow sandstone
Secondary lithology:planar lamination,gray "shale"
Includes fossils?Y
Lithology description: Type locality LACM 6906 "in yellow sands and laminated gray shale" LACM locality 6902 "in coarse yellow sand overlying laminated gray shale" LACM locality 3185 "in coarse yellow sand"
Environment:basinal (siliciclastic)
Geology comments: deep Pacific basin
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Preservation of anatomical detail:good
Disassociated major elements:some
Collection methods and comments
Collection excludes:some macrofossils
Collection methods:surface (float),field collection
Collection size:6 specimens
Reason for describing collection:general faunal/floral analysis
Museum repositories:LACM
Collection method comments: Bird fossils described in this paper are LACM specimens and derive from LACM localities previously in Laguna Niguel. Associated with marine mammals.
Metadata
Also known as:LACM localities 6906, 6902, and 3185; Aliso Creek; El Lazo Road
Database number:13300
Authorizer:J. Hunter, M. Uhen Enterer:J. Hunter, M. Uhen
Modifier:M. Uhen Research group:vertebrate
Created:2002-02-19 12:55:01 Last modified:2019-05-15 08:32:02
Access level:the public Released:2002-02-19 12:55:01
Creative Commons license:CC BY
Reference information

Primary reference:

4418.5% 36240H. Howard. 1976. A new species of flightless auk from the Miocene of California (Alcidae: Mancallinae). Smithsonian Contributions to Paleobiology 27:141-146 [J. Hunter/J. Hunter/M. Uhen]

Secondary references:

35405 L. G. Barnes, S. A. McLeod, and R. E. Rashke. 1985. A late Miocene marine vertebrate assemblage from Southern California. National Geographic Society Research Reports 21:13-20 [M. Uhen/M. Uhen]
35406 H. Howard. 1978. Late Miocene marine birds from Orange County, California. Natural History Museum of Los Angeles County Contributions in Science 290:1-26 [M. Uhen/M. Uhen]
40896 I. Magallanes, J. F. Parham, G.-P. Santos and J. Velez-Juarbe. 2018. A new tuskless walrus from the Miocene of Orange County, California, with comments on the diversity and taxonomy of odobenids. PeerJ 6:e5708 [M. Uhen/M. Shalap/M. Uhen]
64134 J. Velez-Juarbe and A. M. Valenzuela-Toro. 2019. Oldest record of monk seals from the North Pacific and biogeographic implications. Biology Letters 15:1-6 [M. Uhen/M. Uhen/M. Uhen]