Simi Valley Landfill (2000s collection)
Basic information
Sample name: Simi Valley Landfill (2000s collection)
Sample aka: LACM locality 5876
Reference: T. S. Kelly. 2009. A new species of Heliscomys (Rodentia, Heliscomyidae) from the Duchesnean (Middle Eocene) Simi Valley Landfill Local Fauna, Sespe Formation, California. Paludicola 7(3):67-77 [ER 4150]
Geography
Country: United States
State: California
County: Ventura
Coordinate: 34.30° N, -118.79° W
Coordinate basis: estimated from map
Formation: Sespe
Time interval: Middle Eocene
Zone: Duchesnean
Section: Simi Valley
Unit number: 5
Unit order: below to above
Max Ma: 38.398
Min Ma: 38.081
Age basis: paleomag
Geography comments: coordinate is an arbitrary point close within the landfill
"Prothero et al. (1996) placed bed 30A within Chron 17r" which is supported by correlation to the Vieja area in West Texas, where the Buckshot Ignimbrite in equivalent strata has been dated to 38.02 Ma (Kelly et al. 2012) (age estimates based on Ogg 2020)
from the "middle member of the Sespe Formation... within bed 30A"
the highest of five superposed faunas in the Simi Valley section
"Prothero et al. (1996) placed bed 30A within Chron 17r" which is supported by correlation to the Vieja area in West Texas, where the Buckshot Ignimbrite in equivalent strata has been dated to 38.02 Ma (Kelly et al. 2012) (age estimates based on Ogg 2020)
from the "middle member of the Sespe Formation... within bed 30A"
the highest of five superposed faunas in the Simi Valley section
Environment
Lithology: claystone
Taphonomic context: overbank deposit
Habitat comments: according to (Kelly et al. 1991), the lithology is "interbedded structureless sandstone and claystone beds representing a meandering-river floodbasin facies" and the fossils are from one of the "red to green claystone" horizons (see Fig. 2)
Methods
Life forms: primates,rodents,other small mammals
Sampling methods: screenwash
Sample size: 298 specimens
Museum: LACM
Sampling comments: "recently" recovered "by wet screen sieving of bulk matrix during a paleontologic mitigation program"
the original collections from this locality were described by Kelly and co-authors in numerous earlier publications
the inventory is a composite of Kelly (2009, Heliscomys), Kelly 2010a (other small mammals), and Kelly 2010b (other rodents)
the original collections from this locality were described by Kelly and co-authors in numerous earlier publications
the inventory is a composite of Kelly (2009, Heliscomys), Kelly 2010a (other small mammals), and Kelly 2010b (other rodents)
Metadata
Sample number: 4611
Contributor: John Alroy
Enterer: John Alroy
Created: 2024-12-13 09:31:37
Modified: 2024-12-13 09:31:37
Abundance distribution
13 species
4 singletons
total count 298
geometric series index: 20.6
Fisher's α: 2.774
geometric series k: 0.6802
Hurlbert's PIE: 0.7797
Shannon's H: 1.7918
Good's u: 0.9866
Each square represents a species. Square sizes are proportional to counts.
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Register
| †Heliscomys walshi | 45 | |
| type | ||
| Herpetotherium sp. | 1 | |
| †Peradectes californicus | 6 | |
| †Sespedectes singularis | 12 | |
| †Batodonoides walshi | 4 | |
| type | ||
| Oligoryctes sp. | 1 | |
| cf. | ||
| Uintasorex sp. | 1 | |
| cf. | ||
| †Metanoiamys korthi | 102 | |
| †Paradjidaumo reynoldsi | 76 | |
| †Simiacritomys whistleri | 7 | |
| Eomyidae indet. | 12 | |
| not the same as the other rodents | ||
| †Simimys landeri | 30 | |
| Pareumys sp. | 1 | |