Pearson Ranch (Bed CS20) (Eocene of the United States)

Also known as CIT 150, 150-E, 150-W, 150-1/2

Where: Ventura County, California (34.3° N, 119.0° W: paleocoordinates 33.7° N, 107.3° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Sespe Formation, Duchesnean (40.4 - 37.2 Ma)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: D. J. Golz and J. A. Lillegraven. 1977. Summary of known occurrences of terrestrial vertebrates from Eocene strata of southern California. Contributions to Geology, University of Wyoming 15(1):43-65 [J. Alroy/J. Alroy/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 16810: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Patricia Holroyd and Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• Kelly 1990 places UCMP V-5235, V-5368, LACM 5645 at this level, so some of his records may pertain to these sites
initially reported by Stock 1932b
NISP 203+
new "leptictid" of Stock 1935c (NISP 1) said to be lost and of uncertain affinities within the Insectivora by Novacek 1977

following five NISP values estimated from Golz 1976 p. 18
 Salientia -
 Testudines - Trionychidae
Trionychidae indet. Gray 1825 softshell turtle
 Testudines - Testudinidae
Testudinidae indet.3 Batsch 1788 turtle
two marginals from "C.I.T. Loc. 150" plus fragments from "U.C. Loc. V5236 (= C.I.T. Loc. 143..."
 Squamata - Anguidae
Anguidae indet. Gray 1825 squamates
 Squamata -
"Boavus affinis" = Boavus occidentalis Marsh 1871 snake
 Squamata - Boidae
Boidae indet. Gray 1825 boa
 Didelphimorphia - Didelphidae
 Theriamorpha - Sespedectidae
Sespedectes singularis n. sp. Stock 1935 placental
from CIT 150: see Stock 1935c; Novacek 1976
Proterixoides davisi n. sp. Stock 1935 placental
from CIT 150: see Stock 1935c; see Novacek 1985
 Perissodactyla - Brontotheriidae
Duchesneodus uintensis1 Peterson 1931 brontothere
 Perissodactyla - Hyracodontidae
Hyracodontidae indet. Cope 1879 odd-toed ungulate
presumably "Triplopodine or Hyrachyid" from CIT 150 of Stock 1936c
 Perissodactyla - Amynodontidae
Amynodontopsis bodei n. sp.4 Stock 1933 odd-toed ungulate
from CIT 150: see Stock 1933c, 1939a
 Artiodactyla - Protoceratidae
Leptoreodon stocki2 Kelly 1990 protoceratid
 Artiodactyla - Praetragulidae
Simimeryx hudsoni n. sp. Stock 1934 ruminant
from CIT 150: see Stock 1934e; NISP @45
 Artiodactyla - Agriochoeridae
Protoreodon pacificus n. sp. Golz 1976 agriochoerid
see Golz 1976; NISP @33
 Artiodactyla - Oromerycidae
Protylopus pearsonensis n. sp. Golz 1976 even-toed ungulate
see Golz 1976; NISP @20
Eotylopus sp. Matthew 1910 even-toed ungulate
NISP @11
 Acreodi -
Simidectes merriami n. sp. Stock 1933 mesonychian
from CIT 150: see Stock 1933b; including additional CIT 150 material of Coombs 1971; NISP
 Creodonta - Hyaenodontidae
Hyaenodon vetus n. sp., "Hyaenodon exiguus n. sp." = Hyaenodon venturae
Hyaenodon vetus n. sp. Stock 1933 creodont
and type of "Pterodon californicus": Stock 1933a; both from CIT 150; (1+3)
"Hyaenodon exiguus n. sp." = Hyaenodon venturae Mellett 1977 creodont
from CIT 150: Stock 1933a repeated by Mellett 1977
 Rodentia -
Griphomys alecer2 Wilson 1940 rodent
"Griphomys nr. alecer"
 Rodentia - Protoptychidae
Presbymys lophatus n. sp. Wilson 1949 rodent
CIT 150, Wilson 1949a
 Rodentia - Cylindrodontidae
Pareumys milleri Peterson 1919 rodent
Wilson 1940c
 Rodentia - Simimyidae
Simimys simplex Wilson 1935 rodent
Lillegraven and Wilson 1977; type, see Wilson 1935a
 Rodentia - Ischyromyidae
Microparamys tricus n. sp.5 Wilson 1940 rodent
Rapamys sp.2 Wilson 1940 rodent
may be the "larger paramyid" ( of Wilson 1940a
 Primates - Omomyidae
Chumashius balchi n. sp. Stock 1933 tarsier
from CIT 150: see Stock 1933f;