ammonites
Mason Pocket

Also known as Tiffany (in part)

Where: La Plata County, Colorado (37.1° N, 107.6° W: paleocoordinates 42.9° N, 89.3° W)

When: Tiffanian (60.2 - 56.8 Ma)

Environment/lithology: fissure fill; fine-grained, shelly/skeletal, gray shale

• "it might be a fissure filling"
• "dark gray shale very fine in texture... full of bones and fragments" (Matthew 1917)

Size class: macrofossils

Collected by W. Granger in 1916; reposited in the AMNH

Primary reference: G. G. Simpson. 1935. American Museum Novitates 795 [J. Alroy/J. Alroy] more details

See also Alroy 2002, Gingerich 1973, Gingerich 1983, Gunnell 1994, Matthew 1917, Rich and Bohaska 1981

PaleoDB collection 14967: authorized by J. Alroy, entered by J. Alroy on 27.09.1993