The primary data are published occurrences of mammals of late Oligocene (Arikareean) through Miocene (Hemphillian) from the United States. For each species occurrence, the following data were entered: taxonomic name (as of 2009), latitude and longitude, relative age range, geological occurrence, and taphonomic information as specified at the MIOMAP data site.

The MIOMAP database structure parallels the FAUNMAP structure to facilitate analyses that might require both databases.

Data entry began in 2000 and was completed in 2005. Since then, periodic updates have been made and continue today. For use in research applications, the complete or partial database can be downloaded. Users should update the archival database as appropriate for their purposes, and cite the MIOMAP project as noted below* in publications.

M.A. Carrasco extracted the data from the literature and entered it for most of the states. For the states of Idaho, Montana, and Wyoming, data was originally compiled by A.D. Barnosky; checked, added to, and entered by Sabrina Minter and B.P. Kraatz; and updated by A.D. Barnosky and M.A. Carrasco. The Nevada portion of the database was developed by E.B. Davis. A.D. Barnosky coordinated the project.


*Use of this resource in publications should be cited as:
Carrasco, M.A., B.P. Kraatz, E.B. Davis, and A.D. Barnosky. 2005. Miocene Mammal Mapping Project (MIOMAP). University of California Museum of Paleontology https://ucmp.berkeley.edu/miomap/