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Ancient whale coprolites, fault slickensides, shergottites, Ediacara, and Cascadia
Date:7/31/2013

n greenhouse climates can be examined. Widespread warmth is generally accepted to have existed during the Late Cretaceous, but times of growth of continental ice sheets have also been proposed. To test this "greenhouse glacial" hypothesis, Kenneth G. MacLeod and colleagues measured the oxygen isotopic composition of more than 1,000 samples of exceptionally well-preserved shells of single celled organisms (foraminifera) from Tanzania to estimate temperatures spanning a proposed Late Cretaceous glacial interval. Results indicate that hot and remarkably stable conditions prevailed along coastal east Africa during the entire interval examined. There are no indications for growth of glacial ice at this time, and these results support an interpretation that the Earth is effectively ice-free during greenhouse times.


Implications for late Grenvillian (Rigolet phase) construction of Rodinia using new U-Pb data from the Mars Hill terrane, Tennessee and North Carolina, United States
John N. Aleinikoff et al., U.S. Geological Survey, MS 963, Denver, Colorado 80225, USA. Published online ahead of print 30 July 2013, http://dx.doi.org/10.1130/G34779.1.

New ion microprobe U-Pb geochronology of zircon and monazite from high grade gneisses of the Mars Hill terrane in western North Carolina and eastern Tennessee, USA, indicate that these rocks, previously considered to be 1.8 billion-year-old meta-igneous rocks, are really 1.0 billion-year-old metasedimentary rocks. Thus, they do not represent a fragment of ancient Amazonian crust and were not accreted to Laurentia during the Ottawan phase of the Grenvillian orogeny 1.05 billion years ago. Instead, according to John N. Aleinikoff and colleagues, these rocks probably are composed of detritus eroded from Amazonian crust; the sediments were deposited late in the development of the Rodinia supercontinent, no earlier than about 1.02
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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