Kukpowruk River 96-19 (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, 96.3° 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"; concretionary, brown, gray, silty mudstone

• Description. Tree stump 35–40 cm diameter, preserved vertical to

•bedding surrounded by grey/brown silty mudstone with ironstone

•nodules, an incipient nodular texture, and no obvious rooting. The

•bark of the tree is represented by a coaly layer (96 RAS 109). The

•ring structure and some cellular detail is apparent in the cross

•section of the wood (96 RAS 110 taken from near the top of the

•exposed trunk). The bottom of the stump was excavated to a depth

•of approximately 1 m but the root flair was not reached. The tree

•was possibly rooted in a dark grey shale that underlay the silty

•mudstone as revealed by lateral exposures. Ironstone nodules

•Description. Tree stump 35–40 cm diameter, preserved vertical to

•bedding surrounded by grey/brown silty mudstone with ironstone

•nodules, an incipient nodular texture, and no obvious rooting. The

•bark of the tree is represented by a coaly layer (96 RAS 109). The

•ring structure and some cellular detail is apparent in the cross

•section of the wood (96 RAS 110 taken from near the top of the

•exposed trunk). The bottom of the stump was excavated to a depth

•of approximately 1 m but the root flair was not reached. The tree

•was possibly rooted in a dark grey shale that underlay the silty

•mudstone as revealed by lateral exposures. Ironstone nodules

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 34354: authorized by Dana Royer, entered by Dana Royer on 27.08.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Gnetopsida
  -
Pityophyllum sp. Seward 1919
large leaves; occurs within ironstones in silty mudstones
Pinopsida
 Pinales - Podocarpaceae
Podozamites spp. Braun 1843
large leaves; occurs within ironstones in silty mudstones