Also known as Lower Kimberly Member; Upper Roundup Flat Section

Where: Grant County, Oregon (44.7° N, 119.6° W: paleocoordinates 44.5° N, 111.8° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Kimberly Member (John Day Formation), Monroecreekian to Monroecreekian (26.3 - 24.8 Ma)

• above a well-defined tuff and below the Haystack Mbr.

•not clear if Black Bone Hill (JDNM-50; UCMP 863, V-6666) is at this level or in the Haystack Mbr.

•SCLF AA date of 25.3 Ma (Tin Roof Tuff) at base of unit, and date of 22.6 Ma ("? ATR Tuff") in upper part of unit but not at top; based on figure older date is well below lowest horizon actually exposed in main collecting area (Bone Creek), but it seems most conservative to assume that fauna lies between two dated horizons

•one-sigma error on 22.6 Ma date is 0.13 m.y.: Coombs et al. 2001

•localities with partial faunal lists: Black Bone Hill (JDNM-50; UCMP 863, V-6666) Bone Creek (Drees; Picture Gorge 36; UCMP V-5954, V-76124) - this may be within the Rose Creek Member based on Coombs et al. 2001 Haystack 8 (UCMP V-6322) JDNM-46 (UCMP V-6668)

• member-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: L. B. Albright, M. O. Woodburne, T. J. Fremd, C. C. Swisher, B. J. MacFadden and G. R. Scott. 2008. Revised chronostratigraphy and biostratigraphy of the John Day Formation (Turtle Cove and Kimberly Members), Oregon, with implications for updated calibration of the Arikareean North American land mammal age. 116(3):211-237 [J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 17528: authorized by John Alroy, entered by John Alroy on 30.04.1994, edited by Terri Cleary, Mark Uhen and Jonathan Marcot

Creative Commons license: CC BY (attribution)