ammonites
John Day Units E and F ( of the United States)

Also known as Upper Foree Section

Where: Wheeler County, Oregon (44.7° N, 119.6° W: paleocoordinates 44.4° N, 110.7° W)

• coordinate estimated from map

• local area-level geographic resolution

When: John Day Formation, Arikareean (30.8 - 20.4 Ma)

• 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 93078: authorized by John Alroy, entered by John Alroy on 28.12.2009, edited by Chris Bell

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)