The seafloor after a bolide impact: sedimentary and biotic signatures across the Late Devonian carbonate platform following the Alamo Impact Event, Nevada, USA

Tapanila, Leif; Steenberg, Julia R.; Johnson, Carrie J.; Myers, Reed A.

doi:10.1007/s10347-014-0398-0

Cited by 2 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2) (Sandberg et al, 1997;Chamberlain, 1999). Stromatoporoid reefs and mud mounds are locally present within the upper member throughout the impact region (Dunn, 1979;Tapanila and Ekdale, 2004;Tapanila et al, 2014). Quartzarenite is present ~40-100 m upsection from the top of the Alamo Breccia Member and represents a shift from carbonate-to siliciclastic-dominated deposition.…”

Section: Stratigraphymentioning

confidence: 99%

Post-impact depositional environments as a proxy for crater morphology, Late Devonian Alamo impact, Nevada

Retzler¹,

Tapanila²,

Steenberg³

et al. 2015

Geosphere

Self Cite

View full text Add to dashboard Cite

Marine facies of carbonate and siliciclastic sediments deposited on top of the upper Devonian Alamo Breccia Member identify the shape and size of the Alamo impact crater in south-central Nevada (western USA). There are 13 measured sections that record peritidal to deep-subtidal deposition across the impacted platform, and these are correlated to three regional depositional sequences above the Alamo Breccia Member. Facies and accommodation patterns identify a concave seafl oor that we interpret as the post-impact legacy of the Alamo crater. Together with isopach and lithostratigraphic trends in the underlying Alamo Breccia Member, a new map of the Alamo crater is presented showing the eastern outer rim fault and the annular trough. Size estimates were made using the newly defi ned crater features and linear scaling relationships from other marinetarget complex craters. Revised dimensions of the Alamo crater place its transient diameter between 37 and 65 km, and its apparent diameter between 111 and 150 km. These estimates are more than double previous estimates based on the biostratigraphy of the Alamo Breccia Member. If correct, these new estimates place the Alamo crater as one of the largest marine impacts of the Phanerozoic, and conservatively larger than the wellstudied Eocene Chesapeake Bay crater.

show abstract

Section: Stratigraphymentioning

confidence: 99%

Post-impact depositional environments as a proxy for crater morphology, Late Devonian Alamo impact, Nevada

Retzler¹,

Tapanila²,

Steenberg³

et al. 2015

Geosphere

Self Cite

View full text Add to dashboard Cite

show abstract

Impact Resilience: Ecological Recovery of a Carbonate Factory in the Wake of the Late Devonian Impact Event

Rendall

Tapanila

2020

Palaios

View full text Add to dashboard Cite

Conformable limestone deposits bracketing the Alamo breccia (Late Devonian, Nevada) provide a robust dataset for comparisons of depositional environments and marine communities before and after a significant meteor impact. Rank abundances of more than 3000 faunal identifications from 158 sampling localities cluster in three major faunal groups that are arranged in an onshore-offshore lithofacies gradient. Comparison of faunal clusters before and after the impact show little to no dissimilarity. The recovery of marine invertebrate communities following the Alamo impact event was geologically instantaneous. Broad geographic ranges of the fauna may have contributed to ecological resilience. From a geologic perspective, marine communities appear to rebound quickly and fully following meteor impacts, leaving impact-related extinctions as outliers that correspond only to the largest impacts.

show abstract

The seafloor after a bolide impact: sedimentary and biotic signatures across the Late Devonian carbonate platform following the Alamo Impact Event, Nevada, USA

Cited by 2 publications

References 15 publications

Post-impact depositional environments as a proxy for crater morphology, Late Devonian Alamo impact, Nevada

Post-impact depositional environments as a proxy for crater morphology, Late Devonian Alamo impact, Nevada

Impact Resilience: Ecological Recovery of a Carbonate Factory in the Wake of the Late Devonian Impact Event

Contact Info

Product

Resources

About