RT @NESTA_US: Full @USGS_Pubs #map—Glacial sediment across N. US 2.6 mya glaciers covered US, retreating/advancing many times Surface featu…
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1,046 followers
RT @NESTA_US: Full @USGS_Pubs #map—Glacial sediment across N. US 2.6 mya glaciers covered US, retreating/advancing many times Surface featu…
859 followers
RT @NESTA_US: Full @USGS_Pubs #map—Glacial sediment across N. US 2.6 mya glaciers covered US, retreating/advancing many times Surface featu…
5,434 followers
Full @USGS_Pubs #map—Glacial sediment across N. US 2.6 mya glaciers covered US, retreating/advancing many times Surface features easily mapped, thickness of the sediment more complex, important:#agriculture #aquifers& #earthquakes https://t.co/gnoDXFHh