Kukpowruk River 96-23 (Cretaceous to of the United States)

Also known as Kukpowruk River/Cape Lisburne floras

Where: western North Slope County, Alaska (69.3° N, 162.6° W: paleocoordinates 79.1° N, 95.7° 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: fine channel fill; fine-grained, medium, concretionary, yellow sandstone and concretionary, gray, argillaceous mudstone

• Description. Beginning of Smiley’s Section B (see Figure 5). Thick

•medium- to fine-grained, cross-bedded, yellow sandstone with

•several ironstone pebble conglomerate stringers. Wood impressions,

•representing mostly small abraded branchwood, are abundant.

•Some wood fragments are coalified but there are quantities of

•charcoalified fragments less than 1 cm in diameter. Ironstonepreserved

•twigs are sparse. Sample 96 RAS 117 is an ironstonepreserved

•twig from woody debris in a stringer within a 10 m thick

•sandstone. This sand body ends abruptly on the north side of the

•exposure and passes into a grey clayey mudstone with ironstone

•nodules. Pityophyllum and Podozamites fragments occur in the clayey

•mudstone, but plant remains are rare in the ironstones. There may

•be a fault contact with the sands but this was unclear.

•Interpretation. Major river channel sandstones, possibly representing

•the upper delta plain, and plants from better drained interfluves

•than so far seen in the Kukpowruk sequences.

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 34379: authorized by Dana Royer, entered by Dana Royer on 28.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Gnetopsida
  -
Pityophyllum sp. Seward 1919
rare fragments in ironstones within clayey mudstone
Pinopsida
 Pinales - Podocarpaceae
Podozamites spp. Braun 1843
rare fragments in ironstones within clayey mudstone