This Is the Most Ancient Rock in America (That We Know Of)

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Just outside the small town of Watersmeet, Michigan, is an unassuming rock outcrop on the side of the highway. It includes the oldest known rock in the entire United States, at about 3.6 billion years old. Here's how scientists figured that out.

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🎉 Special thanks to Dr. Ross Salerno for reviewing this script for accuracy, and to Dr. Bill Cannon for the coordinates to track down the Watersmeet gneiss.

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Key Research Sources:
https://www.mindat.org/loc-125444.html
https://www.usgs.gov/faqs/what-are-me...
https://geology.com/rocks/gneiss.shtml
https://geologyscience.com/rocks/meta...
https://www.usgs.gov/faqs/what-are-ig...
   • Where are the Oldest Rocks in the U.S.?  
https://www.nrc.gov/materials/fuel-cy...
https://periodic.lanl.gov/92.shtml
https://www.cdc.gov/radiation-emergen...
https://pubs.usgs.gov/gip/geotime/rad...
https://rock.geosociety.org/gsatoday/...
https://www.sciencenews.org/article/u...
https://d32ogoqmya1dw8.cloudfront.net...
https://instruct.uwo.ca/earth-sci/fie...
https://geology.teacherfriendlyguide....
https://rock.geosociety.org/net/gsato...

Music, video, and image credits:
Epidemic Sound
Pexels
https://rock.geosociety.org/net/gsato...
https://en.wikipedia.org/wiki/File:Ba...
https://svs.gsfc.nasa.gov/3457
https://en.wikipedia.org/wiki/Earth#/...
https://tinyurl.com/yw5r8acn