Strathern (LACM 7894)
Basic information
Sample name: Strathern (LACM 7894)
Reference: T. S. Kelly. 2013. New records of small mammals from the latest Uintan (Middle Eocene) Strathern Local Fauna, Sespe Formation, California. Paludicola 9(2):56-69 [ER 4148]
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: Uintan
Unit number: 3
Unit order: below to above
Max Ma: 41.18
Min Ma: 41.03
Age basis: paleomag
Geography comments: "at the Simi Valley Landfill and Recycling Center... above the Caņada de la Brea Fault (CDLBF) at the north end of the landfill"
coordinate estimated based on the map in Fig. 1
in the third bed of the local sequence
according to Kelly et al. (2012), within a normal polarity interval thought to be chron C19n based on the fact that the Lapoint Ash in the Uinta Basin has been dated at 40.26 Ma and is in a reversed zone; that the Simi Valley Landfill fauna is in a reversed zone and correlates biostratigraphically with that zone; and that the Strathern interval is lower in the same section (C19n boundaries based on Ogg 2020)
coordinate estimated based on the map in Fig. 1
in the third bed of the local sequence
according to Kelly et al. (2012), within a normal polarity interval thought to be chron C19n based on the fact that the Lapoint Ash in the Uinta Basin has been dated at 40.26 Ma and is in a reversed zone; that the Simi Valley Landfill fauna is in a reversed zone and correlates biostratigraphically with that zone; and that the Strathern interval is lower in the same section (C19n boundaries based on Ogg 2020)
Environment
Lithology: claystone
Habitat comments: "from reddish claystone beds"
Methods
Life forms: rodents,other small mammals
Sampling methods: screenwash
Sample size: 80 specimens
Museum: LACM
Sampling comments: the fossiliferous beds were exposed "Prior to the 2010 grading and earlier landfill expansions"
"bulk matrix samples" were collected and "Wet screening... followed by heavy liquid separation of the fossils" was carried out
"bulk matrix samples" were collected and "Wet screening... followed by heavy liquid separation of the fossils" was carried out
Metadata
Sample number: 4607
Contributor: John Alroy
Enterer: John Alroy
Created: 2024-12-13 00:51:40
Modified: 2024-12-13 00:51:40
Abundance distribution
6 species
3 singletons
total count 80
geometric series index: 13.2
Fisher's α: 1.502
geometric series k: 0.4611
Hurlbert's PIE: 0.5399
Shannon's H: 1.0053
Good's u: 0.9625
Each square represents a species. Square sizes are proportional to counts.
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