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Geology spans the minute and gigantic, from skeletonized leaves in China to water on mars
Date:4/3/2014

onset of the mid-Cretaceous greenhouse world (about 122 million years ago). This period coincides with the Oceanic Anoxic Event 1a. So far reliable paleotemperature data are missing for the interval under discussion. (1) The integrated dataset indicates that "super greenhouse" conditions prevailed during this period at northern latitudes. It is for the first time that a distinctive warming peak is documented for about 39 degrees north. (2) Sea-surface temperatures of about 31 to 34 degrees Celsius are only slightly lower than those estimated for coeval low latitudinal sites. The data suggest that an equable warm climate, with reduced latitudinal gradients, characterized this period. (3) The high temperatures detected are explained by a major oceanic perturbation in the Pacific causing the huge Ontong Java volcanic province. The increased production of oceanic crust caused an increase of the CO2 emissions, giving way to the onset of the mid-Cretaceous greenhouse phase. At the same time an increase in humidity resulted in a high nutrient supply causing relative high productivity conditions as suggested by our calcareous fossil findings.


Impact spherules from Karelia, Russia: Possible ejecta from the 2.02 Ga Vredefort impact event
Matthew S. Huber et al., Department of Lithospheric Research, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria. Published online 21 Mar. 2014; http://dx.doi.org/10.1130/G35231.1.

Meteorite impact craters are an important part of the geological record. However, prior to 2020 million years ago, when the Vredefort impact structure formed, the terrestrial record of impact craters is nonexistent. For the older impact cratering record, it is necessary to find materials that were ejected from the craters, such as impact spherules, which are mm-scale droplets of melted material. Many estimates of the size of impact craters have b
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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Geology spans the minute and gigantic, from skeletonized leaves in China to water on mars
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