Collins Ranch: Harrisonian, Nebraska

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Rodentia - Sciuridae
Protospermophilus sp. Gazin 1930
Miospermophilus sp. Black 1963
Mammalia - Rodentia - Heliscomyidae
Heliscomys woodi McGrew 1941
recombined as Tylionomys woodi
Mammalia - Rodentia - Heteromyidae
Schizodontomys cf. harkseni (Macdonald 1970)
Proheteromys sp. Wood 1932
Harrymys sp. Munthe 1988
Mammalia - Rodentia - Castoridae
? Palaeocastor sp. Leidy 1869
Mammalia - Rodentia - Mylagaulidae
Promylagaulus riggsi McGrew 1941
Mammalia - Rodentia - Allomyidae
Alwoodia sp. Rensberger 1983
Mammalia - Rodentia - Cricetidae
Paciculus nebraskensis Alker 1969
Mammalia - Lagomorpha - Ochotonidae
Gripholagomys lavocati Green 1972
Mammalia - Erinaceidae
Parvericius sp. Koerner 1940
Mammalia - Proscalopidae
Proscalops secundus Matthew 1909
Mammalia
Herpetotherium youngi (McGrew 1937)
see common names

Geography
Country:United States State/province:Nebraska County:Sheridan
Coordinates: 42.8° North, 102.2° West (view map)
Paleocoordinates:43.6° North, 97.1° West
Basis of coordinate:based on nearby landmark
Altitude:3670 feet
Geographic resolution:small collection
Time
Key time interval:Harrisonian
Age range of interval:24.80000 - 20.43000 m.y. ago
Stratigraphy
Formation:Lavaca Flats Beds Member:Lions Bridge Beds
Stratigraphic resolution:bed
Stratigraphy comments: "late late Arikareean" (= Harrisonian)
Lithology and environment
Primary lithology:planar lamination,fine conglomerate
Lithology description: "1 m bed of fine, laminated, intraclast pebble-conglomerate"
Environment:fluvial indet.
Geology comments: "deposited under flashy high energy fluvial conditions"
Taphonomy
Modes of preservation:body
Size of fossils:mesofossils
Articulated whole bodies:none
Associated major elements:none
Disassociated major elements:some
Disassociated minor elements:many
Collection methods and comments
Collection methods:selective quarrying,field collection
Collection size:39 specimens
Rock censused:45 kg
Reason for describing collection:biostratigraphic analysis
Museum repositories:UNSM
Collection method comments: "less than about 45 kg of gravel concentrate produced a small, fairly diverse microfauna. Reptile remains were abundant, especially jaws with teeth, while no fish, amphibian, or bird elements were recovered. Small mammal taxa are represented by one jaw fragment with one tooth and 38 isolated cheek teeth."
Taxonomic list comments:fauna apart from mammals not discussed
Metadata
Also known as:UNSM Sh-114
Database number:69807
Authorizer:J. Alroy Enterer:J. Alroy
Research group:vertebrate
Created:2007-03-07 21:27:11 Last modified:2007-03-07 23:27:11
Access level:the public Released:2007-03-07 21:27:10
Creative Commons license:CC BY
Reference information

Primary reference:

19303. B. E. Bailey. 2004. Biostratigraphy and biochronology of early Arikareean through late Hemingfordian small mammal faunas from the Nebraska Panhandle and adjacent areas. Paludicola 4(3):81-113 [J. Alroy/J. Alroy]