Simi Valley Landfill (Eocene of the United States)

Also known as LACM 5876

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: Middle Member (Sespe Formation), Duchesnean (39.7 - 37.0 Ma)

Environment/lithology: terrestrial; lithology not reported

Reposited in the LACM

Primary reference: T. S. Kelly, E. B. Lander, D. P. Whistler, M. A. Roder, and R. E. Reynolds. 1991. Preliminary Report on a Paleontologic Investigation of the Lower and Middle Members, Sespe Formation, Simi Valley Landfill, Ventura County, California. PaleoBios 13(50):1-13 [J. Alroy/J. Alroy/J. Ju]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 16813: authorized by John Alroy, entered by John Alroy on 27.09.1993, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• middle or late Duchesnean
overlies Tapo Canyon, Brea Canyon, Strathern, and Pearson Ranch L.F.'s
NISP 124+, apparently <200; 150 seems reasonable
said by Kelly and Whistler 1994 to be in a reversed magnetozone, which Prothero et al. 1992 GSA abs. believe is C17R; however, there is no clear tiepoint
Mammalia
  -
Mammalia indet.1 Linnaeus 1758 mammal
 Rodentia - Simimyidae
Simimys simplex Wilson 1935 rodent
NISP stated nowhere and may be large
Simimys landeri n. sp.1 Kelly 1992 rodent
 Rodentia - Zapodidae
Simiacritomys whistleri n. sp.1 Kelly 1992 jumping mouse
 Rodentia - Heliscomyidae
Heliscomys walshi n. sp.2 Kelly 2009 rodent
said to be new
 Rodentia - Eomyidae
Metanoiamys korthi n. sp.5 Kelly and Whistler 1998 rodent
"Namatomys" sp. said to be new and assigned to Metanoiamys by Chiment and Korth 1996; (16 according to Kelly 1992b)
Paradjidaumo reynoldsi n. sp.1 Kelly 1992 rodent
 Rodentia - Ischyromyidae
Leptotomus sp. Matthew 1910 rodent
 Primates - Omomyidae
Omomyidae indet. Gazin 1958 tarsier
 Primates - Microsyopidae
cf. Uintasorex sp.3 Matthew 1909 primate
LACM 153954
 Theriamorpha - Geolabididae
Batodonoides walshi n. sp.3 Kelly 2010 placental
 Theriamorpha - Oligoryctidae
cf. Oligoryctes sp.3 Hough 1956 placental
LACM 153688
 Theriamorpha - Sespedectidae
Sespedectes singularis Stock 1935 placental
Kelly and Whistler 1994
Proterixoides davisi1 Stock 1935 placental
NISP stated nowhere
 Artiodactyla - Praetragulidae
Simimeryx aff. hudsoni4 Stock 1934 ruminant
 Artiodactyla - Camelidae
Camelidae indet. Gray 1821 camel
 Theriamorpha - Peradectidae
Peradectes californicus4 Stock 1936 marsupial
 Theriamorpha - Herpetotheriidae
Herpetotherium sp.3 Cope 1873 marsupial
LACM 153689