Rose Creek Locality (Cretaceous to of the United States)

Where: Jefferson County, Nebraska (40.1° N, 97.2° W: paleocoordinates 38.2° N, 59.5° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Janssen Clay Member (Dakota Formation), Early/Lower Cenomanian to Early/Lower Cenomanian (99.6 - 93.5 Ma)

• Isolated clay lens

• bed-level stratigraphic resolution

Environment/lithology: fluvial; unlithified, gray claystone and sandstone

• Fluvial ox bow lake type
• Upchurch & Dilcher 1990 (6420); the Janssen Clay Member, which comprises largely sandstones, grey claystones, and lignites. Nearly all identifiable leaf remains occur within a 2-m-thick interval of light gray, jointed, overbank mudstones.

Size class: macrofossils

Preservation: adpression, original carbon

Collection methods: surface (in situ), chemical,

Primary reference: G. R. Upchurch and D. L. Dilcher. 1990. Cenomanian Angiosperm Leaf Megafossils, Dakota Formation, Rose Creek Locality, Jefferson County, Southeastern Nebraska. U.S. Geological Survey Bulletin 1915 [H. Sims/H. Lindon/H. Lindon]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 20815: authorized by Hallie Sims, entered by Heather Lindon on 07.06.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Magnoliopsida
  -
Dicotylophyllum aliquantuliserratum n. sp., Dicotylophyllum expansolobum n. sp., Dicotylophyllum myrtophylloides n. sp., Dicotylophyllum angularis n. sp., Dicotylophyllum rosafluviatilis n. sp.
Dicotylophyllum aliquantuliserratum n. sp. Upchurch and Dilcher 1990
Magnoliopsida subclass unknown
Dicotylophyllum expansolobum n. sp. Upchurch and Dilcher 1990
Magnoliopsida subclass unknown
Dicotylophyllum myrtophylloides n. sp. Upchurch and Dilcher 1990
Magnoliopsida subclass unknown
Dicotylophyllum angularis n. sp. Upchurch and Dilcher 1990
Magnoliidae order unknown; magnoliid-grade foiage
Dicotylophyllum rosafluviatilis n. sp. Upchurch and Dilcher 1990
Magnoliopsida subclass unknown
Angiospermae
 Magnoliales -
Magnoliales "New Genus A"
Magnoliales "New Genus A" Jussieu 1820 magnoliids
cf. Winteraceae, Degeneriaceae, Eupomatiaceae, Annonaceae
 Magnoliid - Magnoliidae
"Magnoliidae "New Genus B"" = Magnoliid
"Magnoliidae "New Genus B"" = Magnoliid Jud 2011
Magnoliidae order unknown; magnoliid-grade foiage
 Laurales -
Pandemophyllum sp., Landonia calophylla n. gen. n. sp., Crassidenticulum decurrens
Pandemophyllum sp. Upchurch and Dilcher 1990
cf. Lauraceae
Landonia calophylla n. gen. n. sp. Upchurch and Dilcher 1990
cf. Amborellaceae, Monimiaceae, Gomortegaceae, Hernandiaceae
Crassidenticulum decurrens Lesquereux 1892
n. comb., cf. Chloranthaceae