By: magic-gigapans
Image: Robin Rohrback, Mid-Atlantic Geo-Image Collection
License: Creative Commons Non Commercial ⧉

Uploaded: 4 May 2020
Last Updated: 26 Jun 2020

156 megapixels
13,724 x 11,356 pixels
45.7 in X 37.9 in at 300dpi
5,397 pixels per inch

Cross-laminated sandstone composed primarily of well-rounded, coarse sand grains from the base of the Ulveso Formation. The Ulveso Formation has been interpreted as an immature aeolian deposit with a proglacial subaerial origin. This sample may have been deposited during a period of dry, windy conditions preceding the growth of a continental ice sheet. As ice accumulated, marine margin facies became remobilized and were deposited farther down the continental slope by the onset of glacial ice. Sample is 5 cm across at its widest point. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harvard University; Eugene Domack, Hamilton College; and Timothy Fox, Hamilton College. For more information on the Snowball Earth Educational Rock Sample Suite, visit http://www.snowballearth.org/samples.html