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Find Your Science at GSA
5 November 2012
GSA Release No. 12-90
Christa Stratton
Director of Education, Communication, & Outreach
El'gygytgyn Crater
El'gygytgyn crater lake.
Image from NASA.

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Pits, Craters, Hollows, Blast Winds, and Spherules — On Earth and Beyond

GSA Annual Meeting & Exposition, Charlotte, North Carolina, USA, 4–7 November 2012

Boulder, CO, USA – Impact cratering is an intense subject of much discussion in the fields of geoscience, geophysics, and planetary science. Fascinating examples include the El’gygytgyn impact structure in the Russian Arctic; pits and hollows on Mercury; the cratering history on Vesta, one of the largest asteroids in the solar system; and possible evidence for far-reaching, intense impact blast winds on Mars.

Session organizers Christian Koeberl of the University of Vienna and Jeffrey Plescia of Johns Hopkins University have brought together fourteen papers covering these topics and more.

Session 225: T158. Impact Cratering in the Solar System: Processes and Products
When: Wednesday, 7 Nov., 8 a.m. to noon
Where: Charlotte Convention Center, Room 213A
Online at:
Presentations (in chronological order)
Impact chemistry: A new frontier in shock physics, by Jay Melosh of Purdue University
The cratering history of Vesta, by David P. O’Brien of the Planetary Science Institute and colleagues
Morphology of pit craters and hollows on Mercury, by Jeffrey J. Gillis-Davis of the Hawaii Institute of Geophysics and Planetology
Impact blast winds: Origin of certain permanent wind streaks on Mars, by Peter H. Schultz of Brown University
Asymmetric lunar craters—Impacts on sloping surfaces, by Jeffrey Plescia of Johns Hopkins University
High spatial resolution geochemistry of K-PG impact spherules, by Joke Belza of Vrije Universiteit Brussel and colleagues
Reevaluation of siderophile element abundances and ratios across the Cretaceous-Paleogene (K-PG) boundary: Implications for the nature of the projectile, by Steven Goderis of Vrije Universiteit Brussel and colleagues
Numerical and hydrogeophysical model of Mount Toondina impact crater, South Australia, by Todd Halihan of Oklahoma State University
The El'gygytgyn impact structure, Russian Arctic: An achondritic impactor? by Christian Koeberl of the University of Vienna and colleagues
Impact glasses and impact melt breccia from the El'gygytgyn structure, Chukotka, Russia, by Lidia Pittarello of the University of Vienna
Detrital shocked zircons eroded from the 1.85 Ga Sudbury impact structure in modern fluvial and glacial sand deposits, by Olivia Thomson of the University of Puerto Rico and colleagues
Alamo seismite styles: Proximal to distal across 150 km, by John E. Warme of the Colorado School of Mines and colleague Jesus A. Pinto
Quantitative stratigraphic modeling of the Late Devonian Alamo impact, Eastern Nevada, by Joseph W. Sheffield of ESRI and colleague Leif Tapanila
Possible effects of sediment transport upon the decay of an impact produced tsunami, by Andrew Schedl of West Virginia State University

Find out what else is new and newsworthy by browsing the complete technical program schedule at

To identify presentations in specific areas of interest, search topical sessions by discipline categories or sponsors using the drop-down menus at, or use your browser's "find" feature to search for keywords or convener names.

Representatives of the media and public information officers from universities, government agencies, and research institutions, may participate in technical sessions, field trips, and other special events. Eligible media personnel will receive complimentary registration and are invited to use GSA's newsroom facilities while at the meeting. Journalists and PIOs must pay for any short courses or field trips in which they wish to participate.

For information on media eligibility, go to Media personnel may register onsite in the GSA Newsroom (room 204) at the Charlotte Convention Center. Wireless Internet access and a quiet space for interviews will be provided in the newsroom, along with beverages and light snacks throughout the day.

Newsroom Hours
• Tuesday, 6 Nov., 7:30 a.m. to 6 p.m.
• Wednesday, 7 Nov., 7:30 a.m. to 5:30 p.m.
Newsroom telephone number (incoming calls): +1-704-339-6207

Contact Christa Stratton, GSA Director of Communications & Marketing, for additional information and assistance.