Where: San Juan County, New Mexico (36.2° N, 108.9° W: paleocoordinates 43.7° N, 86.6° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Naashoibito Member (Ojo Alamo Formation), Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• Flynn et al. 2020: The mammalian faunas of the Naashoibito Member correlates to the Lancian Land Mammal Age, which suggests a late Maastrichtian age (Williamson and Weil, 2008a). Paleobotanical analyses on the megaflora and pollen indicates that the Ojo Alamo Sandstone is earliest Paleocene in age and is correlated with palynostratigraphic zones P1 or P2 ( Anderson, 1959; Nichols, 2003; Williamson et al., 2008; Flynn and Peppe, in press). Recent detrital sanidine and paleomagnetic work has constrained the Naashoibito Member to the latest Maastrichtian indicating the K/Pg boundary is represented by the unconformity between the Naashoibito Member and the Ojo Alamo Sandstone (Peppe et al., 2013; Flynn et al., 2019). These data, coupled with previous sedimentological analyses, demonstrate that the Naashoibito Member is late Maastrichtian in age and the Ojo Alamo Sandstone is early Paleocene in age with an erosive unconformity, that cuts out the Cretaceous-Paleogene boundary, separating the two units

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: mesofossils

Reposited in the NMMNH

Collection methods: bulk, sieve,

Primary reference: A. Weil, T. E. Williamson, F. Pignataro and J. Colon. 2004. The teiid lizard Peneteius discovered in the Upper Cretaceous Naashoibito Member of the Kirtland Formation, San Juan Basin, New Mexico. Journal of Vertebrate Paleontology 24(3, suppl.):127A [M. Carrano/M. Carrano]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 59068: authorized by Matthew Carrano, entered by Matthew Carrano on 08.03.2006, edited by Clint Boyd

Creative Commons license: CC BY (attribution)