Where: McKenzie County, North Dakota (47.8° N, 102.8° W: paleocoordinates 52.2° N, 82.5° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Bear Den Member (Golden Valley Formation), Clarkforkian (56.8 - 55.8 Ma)
• bed-level stratigraphic resolution
Environment/lithology: "channel"; sandstone and conglomeratic shale
Size class: macrofossils
Preservation: adpression
Reposited in the USNM
Collection methods: quarrying,
Primary reference: L. J. Hickey. 1977. Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of western North Dakota. The Geological Society of America Memoir 150:1-183 [H. Sims/S. Ostrowski/J. Cassara]more details
Purpose of describing collection: paleoecologic analysis
PaleoDB collection 10981: authorized by Hallie Sims, entered by Summer Ostrowski on 08.07.2001
Creative Commons license: CC BY (attribution)
Taxonomic list
Angiospermae | |
Corylus acutertiaria Hickey 1977 hazel | |
Cercidiphyllum genetrix Newberry 1868 katsura | |
Glyptostrobus europaeus Brongniart 1833 Chinese swamp cypress
Metasequoia occidentalis Chaney 1951 dawn redwood |