Photograph as originally submitted to this page in the Historical Marker Database www.HMdb.org. Click on photo to resize in browser. Scroll down to see metadata.
The tonstein layer derived from volcanic ash is protected by a metal grate.
Photographer: Abigail Perrie
Taken: August 25, 2018
Caption: The tonstein layer derived from volcanic ash is protected by a metal grate.
Submitted: October 23, 2018, by Alan M. Perrie of Unionville, Connecticut.
Database Locator Identification Number: p450854
File Size: 3.100 Megabytes

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