Boulder, Colo., USA - New Geology articles cover using the architecture of ancient lava-fed deltas to estimate paleo-water levels and past ice thicknesses; bubbles and bubble haloes in lava; iron-silicate microgranules; the importance of durable, biomineralized hard parts; the link between wastewater disposal and earthquakes; shells, ocean pH, and atmospheric CO2; a SWEET hypothesis for mound-building on Mars; marine oxygenation may have preceded oxygenation on land; analysis of fossil plant tissues from Pakistan; and imaging the Transition fault.
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'A'a lava-fed deltas: A new reference tool in paleoenvironmental studies
John L. Smellie et al., Dept. of Geology, University of Leicester, Leicester LE1 7RH, UK. Posted online 18 March 2013 as part of the April 2013 issue; http://dx.doi.org/10.1130/G33631.1.
Knowing ice thickness is essential for making informed estimates of past polar ice sheet volumes and assessing potential changes in eustatic sea levels due to global climate change.
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Geological Society of America