Also known as Twenter; Twenter's Locality No. 26; TW 26
Where: Yavapai County, Arizona (34.8° N, 111.9° W: paleocoordinates 34.9° N, 111.2° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Verde Formation, Blancan (4.9 - 1.8 Ma)
• from a "2 m interval... concentrated in a horizon about 1 m below" a limestone ledge "and 1 m above the base of the exposure"
• bed-level stratigraphic resolution
Environment/lithology: terrestrial; calcareous mudstone
Size class: mesofossils
Collection methods: bulk, quarrying, sieve,
• "screenwashing and quarrying"
Primary reference: N. J. Czaplewski. 1987. Sigmodont rodents (Mammalia; Muroidea; Sigmodontinae) from the Pliocene (early Blancan) Verde Formation, Arizona. Journal of Vertebrate Paleontology 7(2):183-199 [J. Alroy/J. Alroy/J. Alroy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 19620: authorized by John Alroy, entered by John Alroy on 30.04.1994
Creative Commons license: CC BY (attribution)
Taxonomic list
•twice as much matrix was screened at MNA 318 as at MNA 319 and 230 specimens were recovered, but exact number in each sample is unclear and additional, quarried specimens were recovered at MNA 318
•also reported by Nations et al. 1981
•"Peromyscus sp." is omitted by Czaplewski 1990
| Amphibia | |
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Urodela indet. salamander | |
| Aves | |
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Passeriformes indet. Linnaeus 1758 perching bird | |
| Mammalia | |
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Jacobsomys verdensis, Reithrodontomys cf. wetmorei2, Onychomys bensoni2, "Bensonomys arizonae" = Calomys (Bensonomys) arizonae1, Prosigmodon holocuspis, "Sigmodon medius" = Sigmodon minor, Neotoma vaughani n. sp.2
Jacobsomys verdensis Czaplewski 1987 mouse
Prosigmodon holocuspis Czaplewski 1987 mouse
"Sigmodon medius" = Sigmodon minor Gidley 1922 cotton rat | |
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