Antigua at Monarch Beach (Miocene to of the United States)

Also known as Dana Point, north

Where: Orange County, California (33.5° N, 117.7° W: paleocoordinates 33.2° N, 116.1° W)

• coordinate estimated from map

When: Capistrano Formation, Messinian to Messinian (7.2 - 3.6 Ma)

• AGE: edited following EPICC stratigraphic revision [6/13/2020].

Environment/lithology: basinal (siliceous); lithified, diatomaceous siltstone and shale

• depth of 1500 meters or deeper, largely biogenous diatomaceous sediment, basin
• dark to medium brown, well-consolidate, fractured siltstone with some shale and occasional diatomit lenses

Size classes: macrofossils, mesofossils, microfossils

Preservation: original phosphate

Collection methods: quarrying, surface (float), surface (in situ),

Primary reference: W. H. Bonner and W. B. Gilmour. 1988. The Remington Whales: Analyssi of two Late Miocene Mysticeti from Orange County California. Southern California Paleontological Society Special Publication 6:1-49 [M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 55448: authorized by Mark Uhen, entered by Mark Uhen on 25.10.2005, edited by Catalina Pimiento

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudines - Dermochelyidae
? Psephophorus sp. von Meyer 1847 leatherback
Mammalia
 Cetacea - Phocoenidae
? Phocoenidae indet. Gray 1825 porpoise
 Cetacea - Balaenopteridae
Balaenopteridae indet. Gray 1864 rorqual
Chondrichthyes
 Carcharhiniformes - Sphyrnidae
Sphyrna sp. Rafinesque 1810 hammerhead shark
 Lamniformes - Otodontidae
"Carcharocles megalodon" = Otodus megalodon
"Carcharocles megalodon" = Otodus megalodon Agassiz 1835 megalodon
SDNHM 125566, SDNHM 53167
 Lamniformes - Lamnidae
Carcharodon sp. Smith 1838 white shark
Isurus sp. Rafinesque 1810 mackerel shark
Bivalvia
 Nuculida - Nuculidae
Acila sp. Adams and Adams 1858 divaricate nutclam
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
 Pholadida - Pholadidae
? Pholadidae indet. Lamarck 1809 clam
Crustacea
  -
Crustacea indet. BrĂ¼nnich 1772