North of Lost Bridge (USNM 14121) (Eocene of the United States)

Where: Dunn County, North Dakota (47.6° N, 102.8° W: paleocoordinates 51.6° N, 84.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Bear Den Member (Golden Valley Formation), Wasatchian (55.8 - 50.3 Ma)

• bed-level stratigraphic resolution

Environment/lithology: "channel"; sandstone and shale

• Dominantly interchannel sandstone and shale, conglomeritic; lignite; dominantly Lacustrine siltstone
• Sandstone; dominantly interchannel shale/siltstone; dominantly Lacustrine siltstone

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 10979: authorized by Hallie Sims, entered by Summer Ostrowski on 08.07.2001, edited by Jason Cassara

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Dicotyledoneae
 Ericales - Ericaceae
"Kalmia" elliptica
"Kalmia" elliptica Brown 1962 lambkill
Angiospermae
 Fagales - Betulaceae
Corylus acutertiaria
Corylus acutertiaria Hickey 1977 hazel
 Oxalidales - Oxalidaceae
Averrhoites affinis
Averrhoites affinis Newberry 1868 wood sorrel
 Laurales - Lauraceae
Persites argutus
Persites argutus Hickey 1977 laurel
 Coniferales - Cupressaceae
Metasequoia occidentalis, Thuites interruptus
Metasequoia occidentalis Chaney 1951 dawn redwood
Thuites interruptus Bell 1949 cypress
Polypodiopsida
  - Blechnaceae
Woodwardia gravida n. sp.
Woodwardia gravida n. sp. Hickey 1977