ashfall

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ashfall

(ˈæʃˌfɔːl)
n
(Geological Science) the ash that falls as a deposit from the eruption of a volcano
References in periodicals archive ?
Ashfall Fossil Beds (UNSM Ap-116), near Royal, Nebraska, has yielded an extensive collection of equid cranial elements and teeth derived from the Cap Rock Member, Ash Hollow Formation.
The fossil bearing units of the Ash Hollow Formation within Ashfall Fossil Beds State Historical Park in Nebraska have been dated to 11.83 Ma (Perkins et al., 1998) and represent a watering hole environment preserved during an ashfall event.
Ashfall Fossil Beds contains a 2-m-thick bed of volcanic ash in the Cap Rock Member, a ledge-forming sandstone (Skinner et al., 1972), of the Ash Hollow Formation in the drainage basin of Verdigre Creek, Antelope County, northeastern Nebraska (Voorhies and Thomasson, 1979; Voorhies, 1992).
Ashfall Fossil Beds has been extensively researched in comparison, although primarily through unpublished work.
To compare the equid assemblages from the two localities we analyzed a sample of 384 isolated teeth from the Mission Pit locality and 81 skulls with teeth from Ashfall Fossil Beds. Most of the specimens from Mission Pit are in the collections of the South Dakota School of Mines and Technology (SDSM), whereas most of those from Ashfall Fossil Beds are in the collections at the University of Nebraska State Museum (UNSM), Lincoln, Nebraska.
The specimens at Ashfall Fossil Beds allowed examination of the cranial structures as there are two fossae that are generically distinctive and can be used to support the identifications based only on dentition.