Jacagnas River (Oligocene of the United States)

Where: Puerto Rico (18.1° N, 66.5° W: paleocoordinates 17.3° N, 65.6° W)

• coordinate estimated from map

When: Juana Diaz Formation, Chattian (28.1 - 23.0 Ma)

• middle Oligocene (upper Globigerina ampliapertura Zone; Moussa and Seiglie, 1970), lower Chattian, ca. 31 Ma

Environment/lithology: marine; calcareous shale

• calcareous shales

Primary reference: W. D. Matthew. 1916. New sirenian from the Tertiary of Porto Rico, West Indies. Annals of the New York Academy of Science 27:23-29 [M. Uhen/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 63149: authorized by Mark Uhen, entered by Mark Uhen on 08.08.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

 Sirenia - Dugongidae
? Halitherium antillense n. sp. Matthew 1916 dugong