Ricardo (Miocene of the United States)

Also known as Chasse Quarry; LACM 1553; UCMP V-3732, V-5376

Where: Kern County, California (35.4° N, 118.0° W: paleocoordinates 36.0° N, 115.6° W)

• coordinate based on political unit

When: Dove Spring Formation, Clarendonian (13.6 - 10.3 Ma)

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Reposited in the LACM

Primary reference: D. P. Whistler and D. W. Burbank. 1992. Miocene biostratigraphy and biochronology of the Dove Spring Formation, Mojave Desert, California, and characterization of the Clarendonian mammal age (late Miocene) in California. Geological Society America Bulletin 104(6):644-658 [J. Alroy/J. Alroy/J. Marcot]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 19517: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• upper Mbr. 4 and lower Mbr. 5; = upper "C. avawatz./ P. furlongi" and lower "E. aphobus/H. forcei" zones
basalt at top of Mbr. 4 dated at 10.5 +/- 0.25 Ma (KA); level slightly higher than this dated at 10.4 +/- 1.6 Ma (FT on zircon); both dates are rejected by Perkins et al. 1998, who revise the former as 10.94 +/- 0.03 Ma (Ar/Ar)
most earlier lists (e.g., Merriam 1917) span the entire formation
Chasse Quarry (LACM 1553) and two UCMP localities placed here based on location of types of "Hesperosorex" chasseae and "Tomarctus" robustus
status unclear: Pliohippus tantalus Merriam 1919: "between the uppermost and second basalt flows 2 1/2 miles north of Ricardo Post Office"
Mammalia
 Rodentia - Cricetidae
"Copemys dentalis" = Peromyscus dentalis
"Copemys dentalis" = Peromyscus dentalis Hall 1930 deer mouse
"Peromyscus" of Tedford 1961 from Chasse Q.
 Rodentia - Sciuridae
Sciuridae indet.5 Gray 1821 squirrel
Chasse Q.
 Rodentia - Geomyidae
"Thomomys" sp.5 Wied-Neuwied 1839 pocket gopher
 Rodentia - Heteromyidae
Cupidinimus tertius Hall 1930 rodent
Perognathus minutus1 James 1963 pocket mouse
Perognathus furlongi6 Gazin 1930 pocket mouse
 Lagomorpha - Leporidae
 Lipotyphla - Erinaceidae
Lanthanotherium sp. Filhol 1888 hedgehog
 Lipotyphla - Talpidae
Scapanus shultzi n. sp. Tedford 1961 mole
from UCMP V-5376; referred specimen from UCMP V-3732: Tedford 1961
 Perissodactyla - Rhinocerotidae
Teleoceras meridianum4 Leidy 1865 rhinoceros
Peraceras superciliosum4 Cope 1880 rhinoceros
 Perissodactyla - Equidae
Cormohipparion sp.7 Skinner and MacFadden 1977 hipparionine horse
UCMP 19787
Hipparion forcei Richey 1948 hipparionine horse
Hipparion tehonense1 Merriam 1916 hipparionine horse
Dinohippus cf. leardi Drescher 1941 horse
Pliohippus tehonensis Merriam 1915 horse
"Pliohippus fairbanksi n. sp." = Pliohippus tantalus3 Merriam 1913 horse
UCMP 19789
? Protohippus tantalus n. sp.2 Merriam 1913 horse
UCMP 19434 and 21221
 Tribosphenida - Soricidae
"Sorex" sp. Linnaeus 1758 long-tailed shrew
Alluvisorex chasseae n. sp. Tedford 1961 shrew
from Chasse Quarry: see Tedford 1961
 Carnivora - Barbourofelidae
"Barbourofelis osborni" = Barbourofelis whitfordi5
"Barbourofelis osborni" = Barbourofelis whitfordi5 Barbour and Cook 1915 carnivoran
 Carnivora - Mustelidae
Mustelidae indet.5 Fischer 1817 mustelid carnivore
Chasse Q.; may or may not include type of Mustela buwaldi of Merriam 1919 from UCMP 2282
 Carnivora - Canidae
Leptocyon vafer1 Leidy 1858 canine
Epicyon haydeni1 Leidy 1858 bone-crushing dog
Carpocyon robustus1 Green 1948 bone-crushing dog
 Proboscidea - Gomphotheriidae
"Amebelodon burnhami" = Serbelodon burnhami1
"Amebelodon burnhami" = Serbelodon burnhami1 Osborn 1933 gomphothere
 Ungulata - Merycoidodontidae
"Merychyus major" = Ustatochoerus major1
"Merychyus major" = Ustatochoerus major1 Leidy 1858 oreodont
 Ungulata - Camelidae
Camelidae indet.5 Gray 1821 camel
Chasse Q.
 Ungulata - Antilocapridae
Plioceros sp. Frick 1937 pronghorn
"Sphenophalos" of Tedford 1961
Paracosoryx furlongi Frick 1937 pronghorn
Cosoryx sp. Leidy 1869 pronghorn
possibly "Merycodus sp." of Tedford 1961 from Chasse Q.