†Mahgarita stevensi
Mahgarita stevensi ist eine Primatenart, die ab dem Paläogen (Eozän) im Lutetium lebte, das vor rund 47,8 Millionen Jahren begann und bis vor 41,3 Millionen Jahren andauerte.
Daten zu den einzelnen Funden von Mahgarita stevensi
| Sammlung | Epoche, Alter | Geologie, Formation | Kommentar zur Sammlung |
|---|---|---|---|
| Skyline (TMM 41578) | Bartonian zwischen 37.2 und 40.4 Millionen Jahren |
Devil's Graveyard | Tepee Canyon |
| Museum | Kommentar z. Taxonomie | ||
| TMM | Skyline Channels are "along the northern margin of the Devil's Graveyard," which based on Stevens et al. 1984 is just east of the county line overlies Middle Mbr. and underlies Dogie Creek; at same level as Cotter Channels ash immediately beneath Skyline Channels dated at 42.7 +/- 1.6 Ma (KA): Stevens et al. 1984; this date is questioned by Prothero 1996b on paleomagnetic and general biochronologic grounds, and although he points out that the dated biotite flakes were very small his reasoning seems to depend on accepting the very questionable 41.2 Ma date for the Gill Breccia |
| Sammlung | Epoche, Alter | Geologie, Formation |
|---|---|---|
| Skyline (TMM 41715) | Bartonian zwischen 37.2 und 40.4 Millionen Jahren |
Devil's Graveyard |
| Museum | Kommentar z. Taxonomie | |
| TMM | overlies Middle Mbr. and underlies Dogie Creek; at same level as Cotter Channels |
| Sammlung | Kommentar zum Fundort | Epoche, Alter | Geologie, Formation | Kommentar zur Sammlung |
|---|---|---|---|---|
| Casa Blanca | Lake Casa Blanca State Park | Lutetian zwischen 40.4 und 46.2 Millionen Jahren |
Laredo | TMM 42486; Spillway Quarry |
| Kommentar z. Stratigraphie | Lithographie | Museum | Kommentar z. Taxonomie | |
| Uinta C | "massive sandstone, fine-grained" | TMM | two isolated specimens are from nearby TMM 41871 and TMM 42185, which are in the same unit Westgate 1990 reports NISP 101 excluding rodents and indeterminate records; later publications report 288, for a total of 389 plus two species lacking counts; Westgate 1988 reports "nearly 700" and Westgate 1990 "over 700," and I believe the discrepancy is due to counting indeterminate specimens said to be Uinta C | |
| U.a. am Fundort ausgegraben: | Omomys carteri | |||
Literatur
J. A. Wilson, M. S. Stevens 1986, Fossil vertebrates from the latest Eocene, Skyline channels, Trans-Pecos Texas. Contributions to Geology, University of Wyoming Special Paper. 3, p. 221 - 235D. T. Rasmussen, M. S. Stevens 1990, The phylogenetic position of Mahgarita stevensi: protoanthropoid or lemuroid?. International Journal of Primatology. 11:5, p. - 235
J. W. Westgate, M. S. Stevens 2012, Palaeoecology of a primate-friendly, middle Eocene community from Laredo, Texas and a review of stratigraphic occurrences of Paleogene land mammals across the Gulf Coastal Plain, USA. Palaeobiodiversity and Palaeoenvironments. 92:5, p. 497 - 505, DOI: 10.1007/s12549-012-0084-6