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Geological Society of America's top journal, Geology, begins 2014 with 10 new articles
Date:1/8/2014

itic bedrock imply long-term (more than 105 years) erosion rates of 10 to 30 mm per thousand years, similar to shorter-term granitic values. The spatial distribution of erosion rates and geologic evidence imply that topographic relief in the southern Rocky Mountains increased in the past 40 million years; erosion exposed the modern landscape over the past five to 10 million years.


Geomorphic and stratigraphic signals of postglacial meltwater pulses on continental shelves
Andrew N. Green et al., Geological Sciences, University of KwaZulu-Natal, Private Bag X54001, Durban, South Africa; greena1@ukzn.ac.za. Published online ahead of print on 6 Jan. 2014, http://dx.doi.org/10.1130/G35052.1.

Andrew Green and colleagues provide new geomorphological and stratigraphic evidence for abrupt rises in sea level, termed Melt Water Pulses (MWPs), from the South African continental shelf. Two MWPs are documented based on the regional occurrence of remarkably well-preserved submerged shorelines that were drowned in place during these rapid rises in sea level. These are situated at 60 and 100 m depths and considered to correspond with MWP 1A and 1B respectively. Green and colleagues hypothesize that setting aside local differences in topography and sediment supply, areas of similar eustatic and tectonic regimes will have similar features preserved in their stratigraphic and geomorphic records.


Parasequence types in shelfal mudstone strataQuantitative observations of lithofacies and stacking patterns, and conceptual link to modern depositional regimes
Kevin M. Bohacs et al., ExxonMobil Upstream Research Company, P.O. Box 2189, Houston, Texas 77252, USA; Kevin.M.Bohacs@exxonmobil.com. Published online ahead of print on 6 Jan. 2014,

Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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