American Agricultural Chemical Company Mine (Miocene of the United States)

Where: Polk County, Florida (27.8° N, 82.0° W: paleocoordinates 28.0° N, 80.1° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Bone Valley Member (Peace River Formation), Tortonian (11.6 - 7.2 Ma)

• Bradley Fauna; said to be Hemphillian, but Tertiary Mammals II says this is Barstovian, Ba2; lower beds

•Missimer 1999: The Peace River Formation was deposited from about 11 to 4.3 Ma. It is separated from the underlying, middle Miocene Arcadia Formation by an unconformity with a hiatus of 2 to 4 m.y. The unconformity separating the shallow marine sequence (late Miocene) from the overlying deltaic sequence (early Pliocene) has a hiatal gap of 2 to 6 m.y. depending on geographic location.

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal; lithified, pebbly, phosphatic, argillaceous, sandy sandstone

• Bone Valley Formation environment consists of shallow lagoons and bays along the coast. ,nearshore marine, low-energy bays of clay-rich beds and high energy channels
• Clastic rock unit consisting primarily of pebble- to sand-sized phosphates in a matrix of clay and quartz sand.

Size class: macrofossils

Preservation: original phosphate

Reposited in the MCZ

Collection methods: salvage,

Primary reference: G. S. Morgan. 1994. Miocene and Pliocene marine mammal faunas from the Bone Valley Formation of central Florida. Contributions in Marine Mammal Paleontology Honoring Frank C. Whitmore Jr., Proceedings of the San Diego Society of Natural History 29:239-268 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 45469: authorized by Mark Uhen, entered by Nick Pyenson on 25.10.2004, edited by Mark Uhen

Creative Commons license: CC BY (attribution)

Taxonomic list

• Goniodelphis hudsoni MCZ 3920, partial skull lacking the braincase and anterior portion of the rostrum (Allen 1941: pls. 1-3); Scaldicetus sp. MCZ 17886, two teeth; Balaenoptera floridana MCZ 17882, complete right mandible.
Mammalia
 Cetacea -
Scaldicetus sp. Du Bus 1867 toothed whale
 Cetacea - Iniidae
Goniodelphis hudsoni n. gen. n. sp.1
Goniodelphis hudsoni n. gen. n. sp.1 Allen 1941 toothed whale
 Cetacea - Cetotheriidae
Piscobalaena sp.2 Pilleri and Siber 1989 whale
 Cetacea -
"Balaenoptera floridana n. sp." = Balaena cortesii3
"Balaenoptera floridana n. sp." = Balaena cortesii3 Fischer 1829 whale
Reptilia
 Crocodylia -
"Megalodelphis magnidens n. gen. n. sp." = Thecachampsa sericodon3
"Megalodelphis magnidens n. gen. n. sp." = Thecachampsa sericodon3 Cope 1867 crocodilian
MCZ 17883 - holotype (partial mandibular ramus with four teeth); referred specimen: MCZ 17880 (rostral fragment)