Laguna Niguel (Miocene to of the United States)

Also known as LACM localities 6906, 6902, and 3185; Aliso Creek; El Lazo Road

Where: Orange County, California (33.6° N, 117.7° W: paleocoordinates 33.1° N, 115.2° W)

• coordinate stated in text

• local area-level geographic resolution

When: Monterey Formation, Tortonian to Tortonian (11.6 - 5.3 Ma)

• 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).

• formation-level stratigraphic resolution

Environment/lithology: basinal (); yellow sandstone and gray shale

• deep Pacific basin
• 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"

Size class: macrofossils

Reposited in the LACM

Collection methods: surface (float),

• Bird fossils described in this paper are LACM specimens and derive from LACM localities previously in Laguna Niguel. Associated with marine mammals.

Primary reference: H. 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]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 13300: authorized by John Hunter, entered by John Hunter on 19.02.2002, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

 Odontaspidida - Carcharodontidae
"Isurus hastalis" = Cosmopolitodus hastalis1
"Isurus hastalis" = Cosmopolitodus hastalis1 Agassiz 1843 elasmobranch
 Myliobatiformes - Myliobatidae
Myliobatidae indet.1 Bonaparte 1838 eagle ray
 Lamniformes - Otodontidae
"Carcharodon megalodon" = Otodus megalodon1
"Carcharodon megalodon" = Otodus megalodon1 Agassiz 1843 megalodon
 Carchariniformes - Sphyrnidae
Sphyrna sp.1 Rafinesque 1810 hammerhead shark
 Hexanchiformes - Hexanchidae
Hexanchus sp.1 Rafinesque 1810 sixgill shark
 Carangiformes - Carangidae
Carangidae indet.1 Rafinesque 1815
 Scombriformes - Scombridae
Scombridae indet.1 Rafinesque 1815
 Perciformes - Serranidae
Serranidae spp.1 Swainson 1839 perch-like fish
Epinephelus sp.1 Bloch 1793 perch-like fish
 Acanthomorphata - Sciaenidae
Sciaenidae indet.1 Cuvier 1828
 Labriformes - Labridae
"Pimelometopon sp." = Semicossyphus1
"Pimelometopon sp." = Semicossyphus1 Günther 1861 sheepshead
 Salientia -
 Testudines - Dermochelyoidae
aff. Dermochelys sp.1 de Blainville 1816 Leatherback sea turtle
 Charadriiformes - Panalcidae
"Praemancalla wetmorei n. sp." = Miomancalla wetmorei, Fraterculini indet.2, ? Cepphus sp.2, ? Uria sp.2
"Praemancalla wetmorei n. sp." = Miomancalla wetmorei Howard 1976 auk
Fraterculini indet.2 Storer 1960 auk
? Cepphus sp.2 Moehring 1758 auk
? Uria sp.2 Brisson 1760 auk
 Ornithurae - Pelagornithidae
Osteodontornis orri2 Howard 1957 bird
 Gaviiformes - Gaviidae
Gavia brodkorbi n. sp.2 Howard 1978 loon
 Procellariiformes - Hydrobatidae
Oceanodroma sp.2 Reichenbach 1950 storm petrel
 Procellariiformes - Diomedeidae
Diomedea sp.2, "Diomedea ? californica" = Phoebastria anglica2
Diomedea sp.2 Linnaeus 1758 albatross
"Diomedea ? californica" = Phoebastria anglica2 Lydekker 1891 albatross
 Procellariiformes - Procellariidae
Puffinus barnesi n. sp.2 Howard 1978 shearwater
 Suliformes - Sulidae
Sulidae indet.2 Reichenbach 1849 booby
? Miosula media2 Miller 1925 booby
Morus magnus n. sp.2 Howard 1978 gannet
Morus lompocanus2 Miller 1925 gannet
 Sirenia - Dugongidae
Dusisiren cf. jordani1 Kellogg 1925 dugong
 Carnivora - Odobenidae
Odobenidae indet.3 Allen 1880 walrus
cf. Pontolis sp.1 True 1905 walrus
new species
Imagotaria cf. downsi3 Mitchell 1968 walrus
 Carnivora - Otariidae
Otariidae indet.1 eared seal
Pithanotaria starri1 Kellogg 1925 eared seal
 Carnivora - Phocidae
Monachinae indet.3 Trouessart 1897 seal
 Cetacea - Balaenopteridae
Balaenopteridae indet.1 Gray 1864 rorqual
small and large rorquals
 Cetacea - Cetotheriidae
Herpetocetinae indet.3 Steeman 2007 whale
Herpetocetinae indet.3 Steeman 2007 whale
large cetothere
? Nannocetus sp.1 Kellogg 1929 whale
 Cetacea - Monodontidae
Delphinapterinae indet.1 Gill 1871 toothed whale
 Cetacea - Phocoenidae
Piscolithax cf. tedfordi3 Barnes 1984 porpoise
 Cetacea -
Pithanodelphis sp.1 Abel 1905 toothed whale
new species
Atocetus nasalis3 Barnes 1985 toothed whale