Kukpowruk River 98-17 (Cretaceous to of the United States)

Also known as Kukpowruk River/Cape Lisburne floras

Where: western North Slope County, Alaska (69.5° N, 162.7° W: paleocoordinates 79.2° N, 95.4° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Corwin Formation, Albian to Albian (113.0 - 93.9 Ma)

• middle Albian to Cenomanian

• group of beds-level stratigraphic resolution

Environment/lithology: "floodplain"; gray, argillaceous siltstone and coal

• Description. Grey, deeply weathered bentonitic siltstones dissected

•by fine-grained sandstone channel fills and some thin (<0.5 m)

•coals. Ironstone nodules weathering out from the siltstones contain

•a leaf flora with Cephalotaxopsis, and possible Podozamites or Desmiophyllum.

•Ironstones associated with the coals are particularly rich in

•Podozamites/Desmiophyllum. A single, small, palmately-veined but

•fragmented angiosperm was also found. Siltstones are heavily

•rooted with possible Equisetites and some ironstone internal moulds

•of freshwater bivalves are present.

•Interpretation. Floodplain interfluves with channels, ponds and


Size class: macrofossils

Collection methods: quarrying,

• Material stored at the Earth Sciences Department, The Open University, collection # 96 RAS.

Primary reference: R. A. Spicer and A. B. Herman. 2001. The Albian-Cenomanian flora of the Kukpowruk River, western North Slope, Alaska: stratigraphy, palaeofloristics, and plant communities. Cretaceous Research 22:1-40 [D. Royer/D. Royer/D. Royer]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 34390: authorized by Dana Royer, entered by Dana Royer on 28.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalotaxopsis intermedia
occurs in ironstones within siltstones
Pityophyllum sp. Seward 1919
 Pinales - Podocarpaceae
Podozamites spp. Braun 1843
most common in ironstones within coals
 Pinales -
? Desmiophyllum sp. Lesquereux 1878
most common in ironstones within coals
 Equisetales - Equisetaceae
Equisetites sp. Sternberg 1833
occurs in siltstones
 Proteales - Platanaceae
Platanaceae indet. Lestiboudois 1826
Platanus sp. Linnaeus 1753 plane tree