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Geology tracks eruptions, earthquakes, erosion, extinctions & more
Date:7/12/2013

These kilns were built just above the previous winterly spring high-tide level, but are currently located ~155 (plus or minus 15) cm below the corresponding modern level. The kilns were ultimately fired ~300 years ago (1705 plus or minus 35 AD), as shown by optically stimulated luminescence (OSL) dating. Salt production was terminated abruptly by a catastrophic event (major cyclone). Radiocarbon ages additionally measured on the charcoal layers at the kiln's bases and on associated mangrove stump horizons support the OSL ages. Consequently, the outer delta sank at 5.2 plus or minus 1.2 mm/a, including a 0.8 mm/a global sea-level rise over this period. Expecting an accelerating eustatic sea-level rise of up to 7 mm/a, a coastal sinking of up to 8.9 plus or minus 3.3 mm/a is calculated for the next few decades, which will dramatically aggravate the already present problematic situation. Only a prudently-managed control of sediment accretion will keep southern Bangladesh above the sea level.


Massive Cretaceous-Paleogene boundary deposit, deep-water Gulf of Mexico: New evidence for widespread Chicxulub-induced slope failure
Richard A. Denne et al., Marathon Oil Corporation, 5555 San Felipe, Houston, Texas 77056, USA. First published on 3 July 2013, http://dx.doi.org/10.1130/G34503.1.

The largest known submarine landslide has been identified in the Gulf of Mexico, generated by the Chicxulub extraterrestrial impact which also caused the mass-extinction at the end of the Cretaceous. The landslide was triggered when seismic shock waves and tsunamis caused sediments on the Gulf of Mexico seafloor deposited during the prior 10 million years to be eroded and lifted up into the water column. These sediments then settled back down onto the seafloor over the following weeks, blanketing the entire deep-water Gulf of Mexico with a deposit up to 200 meters thick and a volume of 1
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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