Where: Rio Arriba County, New Mexico (36.5° N, 107.0° W)

• Paleocoordinates: 39.9° N, 101.6° W (Wright 2013)

• coordinate based on political unit

When: Chamita Formation, Late/Upper Miocene (11.6 - 5.3 Ma)

• paleomag chron C3An.2n according to MacFadden, but "base of chron 7" = C4An (8.53 - 8.86 Ma) according to Lindsay et al. 1984

•tuff just above this level dated at 7.7 +/- 0.3 Ma (SCLF Ar-Ar on sanidine) by McIntosh and Quade 1995, which is basically consistent with this correlation

• member-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Primary reference: B. J. MacFadden. 1977. Magnetic polarity stratigraphy of the Chamita Formation stratotype (Mio-Pliocene) of North-central New Mexico. American Journal of Science 200 [J. Alroy/J. Alroy/J. Ju]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 19424: authorized by John Alroy, entered by John Alroy on 27.09.1993

Creative Commons license: CC BY (attribution)