Where: Dunn County, North Dakota (47.0° N, 102.7° W: paleocoordinates 51.4° N, 82.6° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Bear Den Member (Golden Valley Formation), Clarkforkian (56.2 - 54.9 Ma)
• bed-level stratigraphic resolution
Environment/lithology: "channel"; claystone
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 10970: authorized by Hallie Sims, entered by Summer Ostrowski on 08.07.2001
Creative Commons license: CC BY (attribution)
Taxonomic list
| Angiospermae | |
|
Cercidiphyllum genetrix Newberry 1868 katsura | |
|
"Cocculus" flabella Wolfe 1966 | |
|
Meliosma longifolia Hickey 1977 | |
| Magnoliopsida | |
Dicotylophyllum oblongatum n. sp.
Dicotylophyllum oblongatum n. sp. Hickey 1977 | |
|
Metasequoia occidentalis Chaney 1951 dawn redwood
Glyptostrobus europaeus Brongniart 1833 Chinese swamp cypress | |