Also known as Knob Hill exposure

Where: Ferry County County, Washington (48.7° N, 118.7° W: paleocoordinates 54.4° N, 101.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Tom Thumb Member (Klondike Mountain Formation), Ypresian (56.0 - 47.8 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, brown mudstone

Size class: macrofossils

Preservation: adpression

Collection methods: Material housed in the Burke Museum of Natural History and Culture, Seattle (UWBM), partly belonging to the Stonerose Interpretive Center, Republic, Washington (SR).

Primary reference: J. A. Wolfe and T. Tanai. 1987. Systematics, phylogeny, and distribution of Acer (maples) in the Cenozoic of western North America. Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and Mineralogy 22(1):1-246 [B. Allen/B. Allen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 227992: authorized by Karl Volkman, entered by Karl Volkman on 14.11.2022

Creative Commons license: CC BY (attribution)