Where: Morton County, North Dakota (47.0° N, 102.1° W: paleocoordinates 51.3° N, 82.0° 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"; conglomeratic siltstone and 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 10968: authorized by Hallie Sims, entered by Summer Ostrowski on 08.07.2001
Creative Commons license: CC BY (attribution)
Taxonomic list
Magnoliopsida | |
Dicotylophyllum anomalum Ward 1887 | |
Angiospermae | |
Persites argutus n. gen. n. sp.
Persites argutus n. gen. n. sp. Hickey 1977 laurel | |
Cercidiphyllum genetrix Newberry 1868 katsura | |
Meliosma longifolia Hickey 1977 | |
"Cocculus" flabella Wolfe 1966 | |
Metasequoia occidentalis Chaney 1951 dawn redwood | |
Polypodiopsida | |
Onoclea hesperia Hickey 1977 | |
Osmunda macrophylla Penhallow 1908 |