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March GEOLOGY and GSA TODAY media highlights
Date:2/29/2008

ower unit exhibiting clay minerals was probably deposited in a long-lived lake setting. An overlying darker-toned and often blocky upper unit drapes the lighter-toned deposits. The upper unit was emplaced during later high-magnitude flooding as a lake, impounded outside of Holden and within adjacent Uzboi Vallis, overtopped the crater rim, draining into the crater. The stratigraphy exposed in Holden crater provides the first geologic context for deposition of clays during persistent wet and perhaps habitable conditions on early Mars.


Identifying tsunami deposits using bivalve shell taphonomy

S.V. Donato et al., McMaster University, School of Geography and Earth Science, Hamilton, Ontario L8P 4A9, Canada. Pages 199-202.

On 28 November 1945, off the coast of what is now Pakistan, a large earthquake (8.1 Mw) produced a destructive tsunami. Despite news reports chronicling the tsunami in Pakistan, Iran, and India, no records describing the magnitude of the event exist for Oman. Donato et al.s study documents the characteristics of a shell bed deposited by the 1945 tsunami in Sur Lagoon, Oman, and describes a new technique for identifying tsunami deposits in the geologic record using shell preservation. This shell bed provides the first physical evidence that the large tsunami impacted this region of Oman.


Rapid warming and salinity changes of Cretaceous surface waters in the subtropical North Atlantic

Thomas Wagner et al., School of Civil Engineering and Geosciences, Devonshire Building, Newcastle University, Newcastle upon Tyne NE1 7RU, UK. Pages 203-206.

Paleo records reveal occasional and rapid releases of greenhouse gases into the atmosphere. The regional consequences on the surface ocean processes and timing between the atmospheric changes and ocean changes, however, are still far from understood. Wagner et al. examined an exceptionally well-preserved section of the
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Contact: Ann Cairns
acairns@geosociety.org
303-357-1056
Geological Society of America
Source:Eurekalert

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