We're taking it WAY back for today's #TBT. This piece of basaltic lava, erupted in about 1085 A.D. from Sunset Crater in Arizona, has impressions of corn cobs on its surface. Pre-historic communities were living in the area during the eruption, and archaeologists believe "corn rocks" like this were made when people placed ears of corn near hornitos, spattering vents that form above lava flows or tubes. As spatter erupted from the vents, it covered the corn then cooled to create the mold. Some of these rocks were found in the walls of habitation structures greater than 4 km (2.5 mi) away from the closest Sunset Crater lava flows.http://on.doi.gov/1CdXypJ
Photo credit from Desert Archaeology, Inc.
#usgs #volcanoes #sunsetcrater #arizona#sanfranciscopeaks #volcanohazardsprogram#cornrocks
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