ammonites
Dead Mans Branch, Alamo Canyon, Lake Valley Formation, Alamogordo Member, Otero (Carboniferous of the United States)

Where: New Mexico (32.8° N, 105.8° W: paleocoordinates 16.1° S, 50.3° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Alamogordo Member (Lake Valley Formation), Osagean (353.8 - 342.8 Ma)

• This unit has been interpreted as the initial horizon of Waulsortian bioherm development in the Sacramento Mountains.

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified lime mudstone and lithified wackestone

• The nonreefal Alamogordo Member has been deposited in relatively deep-water environment very near or at the shelf-break.
• very dark gray, cherty, medium-bedded lime mudstone with interbedded black, shaly, lime wackestone

Size class: macrofossils

Primary reference: D. K. Brezinski. 2000. Lower Mississippian trilobites from southern New Mexico. Journal of Paleontology 74(6):1043-1064 [W. Kiessling/U. Merkel] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 64756: authorized by Wolfgang Kiessling, entered by Uta Merkel on 14.09.2006