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

Uploaded: 13 May 2020
Last Updated: 26 Jun 2020

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Dr. Jay Kaufman of the University of Maryland, who provided this sample, interprets these to be microbial sulfate reduction spots on the bedding surface of the Neoproterozoic (Cryogenian) Santa Helena Formation of the Bambui Group in south-central Brazil. The microbial spots show clear cores and cortices, which notably have distinct sulfur-33 and sulfur-34 abundance differences.