Kukpowruk River 96-20 (Cretaceous to of the United States)

Also known as Kukpowruk River/Cape Lisburne floras

Where: western North Slope County, Alaska (69.3° N, 162.8° W: paleocoordinates 79.1° N, 96.2° 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, silty mudstone

• Description. A tree trunk 2.9 m in length, partially compressed and

•elliptical in cross section, 23 cm (short axis)–34 cm (long axis)

•diameter. The trunk was weathered out on the river bank in three

•pieces. The structure was well-preserved with a coaly bark. The

•trunk was apparently derived from a dark grey, weathering to

•orange/brown, silty mudstone containing large-leafed Podozamites

•and Equisetites. Specimen 96 RAS 111 is a sample of wood from the

•outer edge of the trunk at the apex of the long cross-sectional axis.

•Sample 96 RAS 112 represents Podozamites from the mudstones.

•Interpretation. Floodplain sediments supporting a wooded vegetation

•rich in Podozamites. The strong association at this and the

•previous locality between large logs and Podozamites leaves strongly

•suggests that plants producing Podozamites possessed a straight

•trunk at least 10 m in height.

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 34367: authorized by Dana Royer, entered by Dana Royer on 28.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Pityophyllum sp. Seward 1919
occurs in mudstones
 Pinales - Podocarpaceae
Podozamites spp. Braun 1843
occurs in mudstones; large-leaved
 Equisetales - Equisetaceae
Equisetites ex gr. burejensis
occurs in mudstones