Glen Springs (Miocene to of the United States)

Where: Alachua County, Florida (29.7° N, 82.4° W: paleocoordinates 29.9° N, 80.7° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Peace River Formation (Hawthorn Group), Tortonian to Tortonian (11.6 - 3.6 Ma)

• See Bryant et al. 1992 for revised ages of Hawthorn Group formations.

•Peace River Formation in Florida was likely deposited between 11-4.3Ma. The lower sequence is Tortonian, deposited between 11-8.5Ma, and the upper sequence is Zanclean and deposited between 5.2-4.3Ma (Missimer, 1999)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: W. Auffenberg. 1957. Notes on fossil crocodilians from Southeastern United States. Quarterly Journal of The Florida Academy of Sciences 20:107-113 [P. Mannion/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 144202: authorized by Philip Mannion, entered by Philip Mannion on 02.05.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Crocodylia -
"Gavialosuchus americanus" = Thecachampsa sericodon
"Gavialosuchus americanus" = Thecachampsa sericodon Cope 1867 crocodilian
UF 3395 (plate)
Mammalia
 Sirenia -
Sirenia indet. Illiger 1811 sirenian
Rib fragments
 Sirenia - Dugongidae
"Felsinotherium sp." = Metaxytherium
"Felsinotherium sp." = Metaxytherium de Christol 1840 dugong
Last molar
Chondrichthyes
 Carcharhiniformes - Hemigaleidae
Hemipristis sp. Agassiz 1835 ground shark
Teeth