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Discovery of Earth's northernmost perennial spring
Date:6/16/2014

archaeological investigations. They suggest that in addition to multi-segment ruptures (Prince William Sound and Kodiak segments rupturing together) in 1964 and AD 1020 to 1150 (95% age estimate), a single segment rupture (Kodiak segment alone) occurred in 1788, with earthquake-induced land surface subsidence across much of Kodiak Island and a tsunami that is recorded in historical documents and in sediment sequences, and another, similar rupture of the same Kodiak segment AD 1440 to 1620. These indicate shorter intervals between ruptures of the Kodiak segment than previously thought, and are more frequent than for the Prince William Sound segment.


Giant middle Eocene bryozoan reef mounds in the Great Australian Bight
Alexander G.W.D Sharples et al., School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK. Published online 9 June 2014; http://dx.doi.org/10.1130/G35704.1.

A series of mid-Eocene reef mound complexes have been discovered in the Great Australian Bight, some 100 miles south of Australia. The greater than 500-km-long reef mound complexes are composed of bryozoan build ups and herald the birth of the largest cool-water carbonate province in the southern hemisphere. The reef mounds formed due to a complete shut-down of clastic sediment input from Australia and rising sea level caused by accelerated separation of Australia and Antarctica. The reef mounds were discovered some 500 m beneath the seafloor and mapped utilizing oil-industry and academic two-dimensional seismic profiles. Calibration was given by cuttings samples from an exploration borehole, Potoroo-1, which directly penetrates a mounded complex. Further insights regarding the growth and demise of the reef mound complexes and their paleo-biological and -oceanographic significance will require targeted seismic profiling and, ultimately, coring
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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Discovery of Earth's northernmost perennial spring
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