What were historic Ozark millstones made of, and where did they come from? Here we use various mapping resources to explore a surprising possibility related to Missouri's Dillard Mill State Historic Site.

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Related videos:
- The unusual geologic and human backstory of Dillard Mill:    • Change to this channel: The unusual g...  

Further resources:
- GeoSTRAT (MO DNR): https://modnr.maps.arcgis.com/apps/we...
- The National Map (USGS): https://apps.nationalmap.gov/viewer/
- Overview of Missouri geology (Missouri State University video):    • Written in the Rocks: A Brief History...  

Music (performed by Eric Reuter on a Masterworks hammered dulcimer: https://masterworksok.com) :
- Ozark Outsider theme: sample from Rubythroat Reel (original tune)
- Background music: LaBarque Rambler (original tune)