10Be/9Be and 26Al/10Be support a late Miocene burial age for basal Gray Fossil Site sediments
Pan-American Paleontology
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Abstract
We provide 2 independent radioisotopic age estimates for cored basal sediments of the Gray Fossil Site using cosmogenic nuclides. The first estimate uses meteoric 10Be/9Be from the bottom of the GFS-1 core, as well as from modern local grasses, to constrain the deposition of basal GFS sinkhole complex sediments to 6.60 ± 0.85 Ma. We corroborated this age estimate using in-situ 10Be and 26Al in quartz sands from the GFS-1 core. This estimate provided a looser constraint than the 10Bemet/9Be approach, yielding a minimum burial age for the basal sediments of 4.43 ± 0.34 Ma. These independent geochronometers provide evidence that the deepest GFS sediments are at least early Pliocene in age, and likely date to the late Miocene.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | 10Be/9Be and 26Al/10Be support a late Miocene burial age for basal Gray Fossil Site sediments |
| Series title | Pan-American Paleontology |
| Volume | 1 |
| Issue | 1 |
| Year Published | 2025 |
| Language | English |
| Publisher | Eagle Hill Institute |
| Contributing office(s) | Florence Bascom Geoscience Center |
| Description | 20 p. |
| Country | United States |
| State | Tennessee |
| County | Washington County |
| Other Geospatial | Gray Fossil Site |