Kukpowruk River 98-21 (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 79.2° 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: wet floodplain; concretionary, gray, argillaceous siltstone

• Description. Large cut-bank on the right side of the river looking

•downstream. Grey bentonitic siltstone with iron-claystone nodules

•forms the axis of a syncline. The ironstones preserve ginkgoes (most

•small and dissected but some very large), Podozamites, Desmiophyl-lum,

•ferns and abundant Cephalotaxopsis and numerous an-giosperms.

•These Cretaceous sediments are overlain by brown,

•poorly consolidated gravels of post-Cretaceous age.

•Interpretation. Predominantly an interfluve environment with over-bank

•sediments and ponds, moderately influenced by periodic ash

•falls.

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 34623: authorized by Dana Royer, entered by Dana Royer on 12.09.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Birisia ochotica
occurs in ironstones within siltstones
Birisia cf. oerstedtii
occurs in ironstones within siltstones
Cephalotaxopsis sp.
occurs in ironstones within siltstones
Pinopsida
 Pinales - Podocarpaceae
Podozamites spp. Braun 1843
occurs in ironstones within siltstones
 Pinales -
? Desmiophyllum sp. Lesquereux 1878
occurs in ironstones within siltstones
Pteridopsida
 Gleicheniales - Gleicheniaceae
Gleichenia cf. pseudocrenata
occurs in ironstones within siltstones
Magnoliopsida
 Proteales - Platanaceae
Platanus louravetlanica plane tree
occurs in ironstones within siltstones
Platanus sp. Linnaeus 1753 plane tree
occurs in ironstones within siltstones