Research Article| January 01, 1998 Hybrid fall deposits in the Bishop Tuff, California: A novel pyroclastic depositional mechanism Colin J. N. Wilson; Colin J. N. Wilson 1Institute of Geological and Nuclear Sciences, Private Bag 2000, Taupo 2730, New Zealand Search for other works by this author on: GSW Google Scholar Wes Hildreth Wes Hildreth 2U.S. Geological Survey, M.S. 910, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Geology (1998) 26 (1): 7–10. https://doi.org/10.1130/0091-7613(1998)026<0007:HFDITB>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Colin J. N. Wilson, Wes Hildreth; Hybrid fall deposits in the Bishop Tuff, California: A novel pyroclastic depositional mechanism. Geology 1998;; 26 (1): 7–10. doi: https://doi.org/10.1130/0091-7613(1998)026<0007:HFDITB>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Hybrid fall deposits in the Bishop Tuff show features common to both archetypal fall and surge deposits. Like normal-fall deposits, they have an overall plane-parallel bedding and flat-lying pumice clasts but also, like surge deposits, they show variable development of cross-bedding, some crystal and pumice sorting, and some rounding of pumice clasts. All variations exist from normal-fall deposits, through streaky material with incipient development of cross-bedding, to the hybrid fall deposits with well-developed cross-bedding. The streaky and hybrid deposits are interpreted as fall material contemporaneously redeposited by strong (up to 40 m/s) swirling winds, comparable to firestorm whirlwinds, generated by air currents associated with coeval emplacement of pyroclastic flows. Recognition of hybrid fall deposits is important in interpreting the dynamics of explosive eruptions and correctly assessing volcanic hazards. However, although such deposits may be commonly produced by explosive eruptions, especially where pyroclastic flows accompany fall activity, they are likely to be overlooked, or wrongly interpreted as surge deposits or secondary, reworked material. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Wilson et al. (1998) studied this question.