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REVISED STRATIGRAPHIC RELATIONSHIPS WITHIN THE LOWER FORT UNION FORMATION (TULLOCK MEMBER, GARFIELD COUNTY, MONTANA, U.S.A.) PROVIDE A NEW FRAMEWORK FOR EXAMINING POST K–PG MAMMALIAN RECOVERY DYNAMICS

Weaver, Lucas N ; Tobin, Thomas S ; Claytor, Jordan R ; Wilson Deibel, Paige K ; Clemens, William A ; Wilson Mantilla, Gregory P

Palaios, 2022-04, Vol.37 (4), p.104-127 [Periódico revisado por pares]

Society for Sedimentary Geology

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Título:
REVISED STRATIGRAPHIC RELATIONSHIPS WITHIN THE LOWER FORT UNION FORMATION (TULLOCK MEMBER, GARFIELD COUNTY, MONTANA, U.S.A.) PROVIDE A NEW FRAMEWORK FOR EXAMINING POST K–PG MAMMALIAN RECOVERY DYNAMICS
Autor: Weaver, Lucas N ; Tobin, Thomas S ; Claytor, Jordan R ; Wilson Deibel, Paige K ; Clemens, William A ; Wilson Mantilla, Gregory P
Assuntos: adaptive radiation ; Biscuit Basin ; Cenozoic ; Chordata ; Cretaceous ; faunal studies ; fluvial environment ; Fort Union Formation ; Garbani Quarry ; Garfield County Montana ; Hell Hollow ; K-Pg boundary ; lithostratigraphy ; lower Paleocene ; Mammalia ; Mesozoic ; Montana ; Paleocene ; paleoecology ; paleoenvironment ; Paleogene ; Paleontology ; petrography ; stratigraphic boundary ; Stratigraphy ; taphonomy ; Tertiary ; Tetrapoda ; Tullock Member ; United States ; Upper Cretaceous ; Vertebrata ; vertebrate
É parte de: Palaios, 2022-04, Vol.37 (4), p.104-127
Descrição: The Hell Creek region of northeastern Montana is an excellent study system to explore the rise to dominance of mammalian faunas after the Cretaceous–Paleogene (K–Pg) mass extinction. The Tullock Member of the Fort Union Formation exposed in that region was deposited during the first 1.2 Ma after the Chicxulub bolide impact. Some aspects of post-K–Pg mammalian succession remain obscure, however, due to a lack of finer stratigraphic resolution between vertebrate fossil localities. Here, we present a new stratigraphic model for the lower and middle Tullock and identify a stratigraphic succession of five mammal-bearing sedimentary units that span the first ∼ 900 ka of the Paleocene. Most notably, we find that middle Tullock fossil localities, which were previously thought to be deposited by a single, large fluvial channel complex, are derived from two temporally and lithologically distinct sedimentary units: the Biscuit Springs unit (BS) and the Garbani channel (GC). The top of the GC is stratigraphically above the top of the BS, but in some places cuts through the entirety of the BS, a relationship that previously complicated interpretations of their relative age. This cross-cutting relationship reveals that the BS is older than the GC. Thus, the BS local fauna represents a potential intermediate between the older local faunas from the post-K–Pg ‘disaster’ interval and the younger, more taxonomically/ecologically diverse GC local fauna. This new stratigraphic framework sets the stage for future studies focused on the pattern and timing of biotic recovery in the aftermath of the K–Pg mass extinction.
Editor: Society for Sedimentary Geology
Idioma: Inglês

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REVISED STRATIGRAPHIC RELATIONSHIPS WITHIN THE LOWER FORT UNION FORMATION (TULLOCK MEMBER, GARFIELD COUNTY, MONTANA, U.S.A.) PROVIDE A NEW FRAMEWORK FOR EXAMINING POST K–PG MAMMALIAN RECOVERY DYNAMICS

Weaver, Lucas N ; Tobin, Thomas S ; Claytor, Jordan R ; Wilson Deibel, Paige K ; Clemens, William A ; Wilson Mantilla, Gregory P

Society for Sedimentary Geology

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