Douglas Canyon: Early Miocene - Late Miocene, Washington
collected by A. D. Hoffman 1931

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Angiospermae - Fagales - Fagaceae
Quercus simulata leaf Knowlton 1898
Angiospermae - Fagales - Betulaceae
Betula heteromorpha leaf Knowlton 1902
Angiospermae - Rosales - Rhamnaceae
Angiospermae - Rosales - Ulmaceae
Ulmus speciosa leaf Newberry 1883
Angiospermae - Rosales - Rosaceae
Angiospermae - Rosales - Papilionaceae
Angiospermae - Malpighiales - Salicaceae
Populus lindgreni leaf Knowlton 1898
Angiospermae - Celastrales - Celastraceae
Angiospermae - Fabales - Fabaceae
Angiospermae - Moraceae
Angiospermae - Magnoliales - Magnoliaceae
Angiospermae - Proteales - Platanaceae
Acer bendirei leaf Lesquereux 1888
Angiospermae - Laurales - Lauraceae
Laurus grandis leaf Lesquereux 1883
see common names

Geography
Country:United States State/province:Washington County:Douglas
Coordinates: 47.5° North, 119.9° West (view map)
Paleocoordinates:50.4° North, 112.7° West (Wright 2013)
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period: Neogene Epoch: Miocene
10 m.y. bin: Cenozoic 5 - Cenozoic 6
Key time interval: Early Miocene - Late Miocene
Age range of interval: 23.04 - 5.333 m.y. ago
Stratigraphy
Formation:Douglas Canyon
Stratigraphic resolution:bed
Stratigraphy comments: beneath the "Columbia River lavas" and said to be "late Miocene" and equivalent to the "Latah formation of Spokane" based on floral composition; the age of the Latah Formation is from "12.1-21.3 million years" according to Engel 2004, i.e., early or middle Miocene
Lithology and environment
Primary lithology:planar lamination "shale"
Lithology description: "well-stratified series of interbedded light gray to buff-colored arkosic sands and light to very dark gray shales... The plant remains were obtained from a thinly laminated lignitic shale bed approximately a foot thick"
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body,adpression
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:general faunal/floral analysis
Collectors:A. D. Hoffman Collection dates:June 1931
Collection method comments: Walker Museum collection
Taxonomic list comments:plant organs not directly stated, but presumably leaves based on nomenclature and listing of "Wood, stems, bark, several species" at end of floral list
Metadata
Database number:103753
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Alroy Research group:paleobotany
Created:2011-02-01 17:28:10 Last modified:2025-02-22 15:12:02
Access level:the public Released:2011-02-01 17:28:10
Creative Commons license:CC0
Reference information

Primary reference:
34987. A. D. Hoffman. 1932. The Douglas Canyon flora of east central Washington. Journal of Geology 40(8):735-738 [J. Alroy/J. Alroy]