Bear Flat: Late/Upper Pleistocene, Canada
collected by R. J. Hebda, M. Geertsema 2001

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Rodentia - Sciuridae
Tamiasciurus hudsonicus (Erxleben 1777)
1 specimen
Mammalia - Rodentia - Cricetidae
Peromyscus maniculatus (Wagner 1843)
20 specimens
Microtus pennsylvanicus (Ord 1815)
16 specimens
Microtus xanthognathus (Leach 1815)
46 specimens
Clethrionomys gapperi (Vigors 1830)
23 specimens
Mammalia - Lagomorpha - Leporidae
Lepus americanus Erxleben 1777
13 specimens
see common names

Geography
Country:Canada State/province:British Columbia
Coordinates: 56.3° North, 121.2° West (view map)
Paleocoordinates:56.3° North, 121.2° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Quaternary Epoch:Pleistocene
10 m.y. bin:Cenozoic 6
Key time interval:Late/Upper Pleistocene
Age range of interval:0.12600 - 0.01170 m.y. ago
Age estimate:12567 ± 49 to 11507 ± 52 YBP (14C)
Stratigraphy
Stratigraphic resolution:bed
Stratigraphy comments: "at a depth of 241-265 cm below surface" and the bones "yielded uncalibrated radiocarbon ages of 11 507 ± 52 years BP (AA46353) and 12 567 ± 49 years BP (AA43652)"
Lithology and environment
Primary lithology: silty claystone
Lithology description: "prismatic silty-clay"
Environment:"floodplain"
Glacial or sequence phase:late glacial
Geology comments: "formed by mudflows and sheet flooding"
Taphonomy
Modes of preservation:body,bone collector
Size of fossils:macrofossils,mesofossils
Feeding/predation traces:gastric dissolution
Collection methods and comments
Collection methods:bulk,sieve,field collection
Minimum sieve size:0.500
Reason for describing collection:biostratigraphic analysis
Collectors:R. J. Hebda, M. Geertsema Collection dates:2001
Collection method comments: "blocks of sediment were collected and bagged, then... washed with a gentle spray of water on a 500 [micro]m screen"
Metadata
Database number:83951
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Alroy Research group:vertebrate
Created:2008-09-10 14:26:26 Last modified:2010-01-14 18:47:17
Access level:the public Released:2008-09-10 14:26:26
Creative Commons license:CC BY
Reference information

Primary reference:

28120. R. J. Hebda, J. A. Burns, M. Geertsema and A. J. T. Jull. 2008. AMS-dated late Pleistocene taiga vole (Rodentia: Microtus xanthognathus) from northeast British Columbia, Canada: a cautionary lesson in chronology. Canadian Journal of Earth Sciences 45(5):611-618 [J. Alroy/J. Alroy]