Where: Arizona (35.1° N, 112.6° W: paleocoordinates 35.3° N, 111.8° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Onyx Marble Formation, Pliocene (5.3 - 2.6 Ma)
• The onyx marble containing these specimens was mined from Bonner Quarry by members of the Southwest Onyx and Marble Company from faulted Middle Permian Supai formations on the side of a high angled fault. E. D. McKee was quoted by Petrunkevitch (1945) as stating: "The fault passes under and therefore, antedates basalt flows a few miles to the west and these are of a period I consider to be of Pliocene age. The age of the deposit is definitely 'post-faulting' which means since the middle of Cenozoic time, but deposition might have been any time from then to the present." Pierce (1951) gave an age of between 12 and 50 million years. Petrunkevitch (1955) dated other fossils found in this formation as "?Pliocene", which for lack of other information, we will follow here.
• group of beds-level stratigraphic resolution
Environment/lithology: cave; lithified travertine
Size class: mesofossils
Collected by Southwest Onyx and Marble Company; reposited in the LACM, YPM
• Repository: San Diego Natural History Museum. Petrunkevitch's specimens came from SDNHM originally but were placed in the YPM collection. Pierce's specimens came from J.W. Fisher, president of the Southwest Onyx and Marble Company, donated to LACM.
Primary reference: A. Petrunkevitch. 1945. Calcitro fisheri, a new fossil arachnid. American Journal of Science 243:320-329 [M. Clapham/M. Clapham] more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 152091: authorized by Matthew Clapham, entered by Matthew Clapham on 07.11.2013
Creative Commons license: CC BY (attribution)