Kukpowruk River 98-22 (Cretaceous to of the United States)

Also known as Kukpowruk River/Cape Lisburne floras

Where: western North Slope County, Alaska (69.5° N, 162.8° W: paleocoordinates 79.3° 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: crevasse splay; concretionary, argillaceous coal and gray, argillaceous mudstone

• Description. Downstream end of cutbank section containing locality

•98-21. Here the same medium grey, bentonitic mudstones contain

•a thin poor quality coal associated with numerous iron-claystone

•nodules yielding radially organised digitate Ginkgo leaves plus some

•Podozamites. No angiosperms were seen. A thin band of medium

•grey, weathering to orange, lenticular and cross-bedded fine-grained

•sandstone was exposed near the river level and contained

•branch impressions and comminuted plant debris. Equisetites rhi-zomes

•with nodules also occurred together with some 1 cm wide

•vertical burrows.

•Interpretation. Channel sands with interfluve overbank sediments

•and short-lived mire environments, frequently influenced by ash


Size class: macrofossils

Collection methods: quarrying,

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 34626: authorized by Dana Royer, entered by Dana Royer on 12.09.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Pinales - Podocarpaceae
Podozamites spp. Braun 1843
occurs in coal
 Equisetales - Equisetaceae
Equisetites sp. Sternberg 1833
rhizomes; occurs with nodules in fine sandstone