ammonites
Yoder (Eocene of the United States)

Also known as SDSMT V-5310; Yoder Quarry #1

Where: Goshen County, Wyoming (42.0° N, 104.2° W: paleocoordinates 43.4° N, 95.5° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Yoder Member (Chadron Formation), Chadronian (37.2 - 33.9 Ma)

• member-level stratigraphic resolution

Environment/lithology: terrestrial; ferruginous, red, sandy siltstone and green sandstone

• "16.2 meters of variegated red, green and burgundy claystone, sandstone and conglomerate... The most common lithology is brick red, fine sandy, silstone.... Most of the small to medium sized species... come from this facies... Typically the sandstones are purple or green... They are arkoskic and exhibit low to high angle crossbedding. Most of the large species have been found in this facies."

Size class: macrofossils

Reposited in the SDSM

Primary reference: A. J. Kihm. 1987. Mammalian paleontology and geology of the Yoder Member, Chadron Formation, east-central Wyoming. Dakoterra 3:28-45 [J. Alroy/J. Alroy/J. Alroy] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 17045: authorized by John Alroy, entered by John Alroy on 18.02.1993

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