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 (40.4 - 37.2 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 indet.1 Linnaeus 1758 mammal
 Primates - Microsyopidae
cf. Uintasorex sp.3 Matthew 1909 primate
LACM 153954
 Primates - Omomyidae
Omomyidae indet. Gazin 1958 tarsier
 Rodentia - Simimyidae
Simimys simplex Wilson 1935 rodent
NISP stated nowhere and may be large
Simimys landeri n. sp.1 Kelly 1992 rodent
 Rodentia - Eomyidae
Paradjidaumo reynoldsi n. sp.1 Kelly 1992 rodent
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)
 Rodentia - Heliscomyidae
Heliscomys walshi n. sp.2 Kelly 2009 rodent
said to be new
 Rodentia - Ischyromyidae
Leptotomus sp. Matthew 1910 rodent
 Rodentia - Zapodidae
Simiacritomys whistleri n. sp.1 Kelly 1992 jumping mouse
 Lipotyphla - Geolabididae
Batodonoides walshi n. sp.3 Kelly 2010 placental
 Tribosphenida - Apternodontidae
cf. Oligoryctes sp.3 Hough 1956 placental
LACM 153688
 Macroscelidea - Amphilemuridae
Proterixoides davisi1 Stock 1935 elephant shrew
NISP stated nowhere
Sespedectes singularis Stock 1935 elephant shrew
Kelly and Whistler 1994
 Ungulata - Camelidae
Camelidae indet. Gray 1821 camel
 Ungulata - Praetragulidae
Simimeryx aff. hudsoni4 Stock 1934 ruminant
 Theriiformes - Peradectidae
Peradectes californicus4 Stock 1936 metatherian
 Theriiformes - Herpetotheriidae
Herpetotherium sp.3 Cope 1873 marsupial
LACM 153689