Ricardo (Miocene of the United States)

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

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 - Sciuridae
Sciuridae indet.5 Gray 1821 squirrel
Chasse Q.
 Rodentia - Geomyidae
"Thomomys" sp.5 Wied-Neuwied 1839 pocket gopher
 Rodentia - Heteromyidae
Perognathus furlongi6 Gazin 1930 pocket mouse
Perognathus minutus1 James 1963 pocket mouse
Cupidinimus tertius Hall 1930 rodent
 Rodentia - Cricetidae
"Copemys dentalis" = Peromyscus dentalis
"Copemys dentalis" = Peromyscus dentalis Hall 1930 deer mouse
"Peromyscus" of Tedford 1961 from Chasse Q.
 Lagomorpha - Leporidae
 Theriamorpha - Erinaceidae
Lanthanotherium sp. Filhol 1888 hedgehog
 Theriamorpha - Soricidae
Alluvisorex chasseae n. sp. Tedford 1961 shrew
from Chasse Quarry: see Tedford 1961
"Sorex" sp. Linnaeus 1758 long-tailed shrew
 Theriamorpha - Talpidae
Scapanus shultzi n. sp. Tedford 1961 mole
from UCMP V-5376; referred specimen from UCMP V-3732: Tedford 1961
 Perissodactyla - Rhinocerotidae
Peraceras superciliosum4 Cope 1880 rhinoceros
Teleoceras meridianum4 Leidy 1865 rhinoceros
 Perissodactyla - Equidae
Hipparion forcei Richey 1948 hipparionine horse
Hipparion tehonense Merriam 1916 hipparionine horse
Cormohipparion sp.7 Skinner and MacFadden 1977 hipparionine horse
UCMP 19787; may include type of "Hipparion mohavense callodonte" from UCMP 2281, see Merriam 1915d, 1919; "H. cf. mohavense" of Tedford 1961
Dinohippus cf. leardi Drescher 1941 horse
? Protohippus tantalus n. sp.2 Merriam 1913 horse
UCMP 19434 and 21221
"Pliohippus fairbanksi n. sp." = Pliohippus tantalus3 Merriam 1913 horse
UCMP 19789
Pliohippus tehonensis Merriam 1915 horse
 Artiodactyla - Camelidae
Camelidae indet.5 Gray 1821 camel
Chasse Q.
 Artiodactyla - Antilocapridae
Paracosoryx furlongi Frick 1937 pronghorn
Cosoryx sp. Leidy 1869 pronghorn
possibly "Merycodus sp." of Tedford 1961 from Chasse Q.
Plioceros sp. Frick 1937 pronghorn
"Sphenophalos" of Tedford 1961
 Artiodactyla - Merycoidodontidae
Ustatochoerus californicus Merriam 1919 oreodont
"U. cf. californicus" of Tedford 1961 from Chasse Quarry
 Carnivora - Nimravidae
"Barbourofelis osborni" = Barbourofelis whitfordi5
"Barbourofelis osborni" = Barbourofelis whitfordi5 Barbour and Cook 1915 false sabre-tooth
 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, "Tomarctus robustus n. sp." = Carpocyon robustus, "Epicyon aphobus" = Epicyon haydeni
Leptocyon vafer1 Leidy 1858 canine
"Tomarctus robustus n. sp." = Carpocyon robustus Green 1948 bone-crushing dog
see Tedford 1961; from UCMP V-3732
"Epicyon aphobus" = Epicyon haydeni Leidy 1858 bone-crushing dog
includes "Aelurodon aphobus" and possibly "Osteoborus cf. californicus" of Tedford 1961 from Chasse Q.; includes type from UCMP 2281 and possibly referred specimens from UCMP 2769, 2733 of Merriam 1919; listed by Wang et al. 1999 at LACM 1553, 5428, 5537, 6041, LACM-CIT 6, 1003, UCMP V-2769
 Proboscidea - Gomphotheriidae
Serbelodon burnhami Osborn 1933 gomphothere
may include type of Osborn 1933 from "just above the last basalt flow some miles northeast of Ricardo post office and apparently in or near the base of the Ricardo" although Whistler and Burbank do not indicate the type's position