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8 August 2022 EXTRAORDINARY ACCUMULATION OF ARVICOLINE RODENTS FROM LITTLE DELL DAM (PLEISTOCENE), UTAH
Charles B. Withnell, Christopher J. Bell, Christopher N. Jass
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Abstract

An accumulation of Pleistocene owl pellets (strigilites) containing 30 arvicoline rodent teeth was found at the Little Dell Dam fossil site outside of Salt Lake City, Salt Lake County, Utah, in 1992. The accumulation was recovered in a single block of matrix with partially exposed teeth. We used high-resolution x-ray computed tomography (CT) to segment, digitally prepare, and describe teeth belonging to Allophaiomys pliocaenicus, Mictomys kansasensis, or Mictomys meltoni, and a previously recognized but unnamed morphotype of Phenacomys. Digital preparation revealed 10 associated upper or lower dentitions of those taxa. A reinterpretation of the age of the site (∼150 thousand years ago) using arvicoline rodent biochronology was made based on recent research at Cathedral Cave, Nevada. The new estimate is a much younger age for the Little Dell Dam fauna from Locality 2 than was previously reported.

Se encontró en 1992 una acumulación de regurgitaciones estrígidas del Pleistoceno (estrigilitas) que contienen 30 dientes de roedor arvicolina en el sitio de fósiles de la presa Little Dell, en las afueras de Salt Lake City, condado de Salt Lake, Utah. La acumulación se recuperó en un solo bloque de matriz con dientes parcialmente expuestos. Utilizamos tomografía computarizada (TC) de rayos X de alta resolución para segmentar, preparar digitalmente y describir dientes pertenecientes a Allophaiomys pliocaenicus, Mictomys kansasensis o Mictomys meltoni, y un morfotipo de Phenacomys previamente reconocido pero sin nombre. La preparación digital reveló diez denticiones superiores o inferiores asociadas de esos taxones. Se realizó una reinterpretación de la edad del sitio (∼ 150 ka) usando biocronología de roedores arvicolina basada en una investigación reciente en Cathedral Cave, Nevada. Esa es una edad mucho más temprana para la fauna de la presa Little Dell de la localidad 2 de lo que se informó anteriormente.

Charles B. Withnell, Christopher J. Bell, and Christopher N. Jass "EXTRAORDINARY ACCUMULATION OF ARVICOLINE RODENTS FROM LITTLE DELL DAM (PLEISTOCENE), UTAH," The Southwestern Naturalist 66(2), 91-101, (8 August 2022). https://doi.org/10.1894/0038-4909-66.2.91
Received: 9 October 2020; Accepted: 17 February 2022; Published: 8 August 2022
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