Image: Archean Greenstone Pillow Lava in Michigan USA 3

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Description: Hand specimen of greenstone (metamorphosed basaltic pillow lava) of the Mona Formation (part of the Ishpeming Greenstone Belt) of Neoarchean age (~2.7 Ga) exposed at a road cut between Marquette and Negaunee in the Upper Peninsula of Michigan, USA.
Title: Archean Greenstone Pillow Lava in Michigan USA 3
Credit: https://www.flickr.com/photos/jsjgeology/8499232782/sizes/o/in/photostream/
Author: James St. John (jsj1771) https://www.flickr.com/people/jsjgeology/
Usage Terms: Creative Commons Attribution 2.0
License: CC BY 2.0
License Link: https://creativecommons.org/licenses/by/2.0
Attribution Required?: Yes
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