Name/Title
S11.11.006Description
The cliff face with evidence of spalling on the rockfall outcrop after rockfall in Pomeroy, Meigs County, Ohio. At 2:00 a.m. on December 2, 1971, approximately 830 cubic yards of sandstone, principally in the form of large blocks, fell from a cliff in Pomeroy. Several of these blocks bounded into the mail-sorting room and parking lot of the Pomeroy Post Office, on Second Street, destroying a corner of the building and filling the parking lot with rock. The sandstone cliff at this location is cut by joints that run parallel to the cliff face. Beneath the sandstone is a weak shale that has been eroded, thus providing little basal support for the overlying sandstone. The rockfall material is the Pomeroy sandstone of the Monongahela Group. Bedrock is from the Pennsylvanian Geologic Period. The image was made by Michael C. Hansen in December 1971.
For more information, see: When the Hills Come Tumbling Down--Landslides in Ohio by Michael C. Hansen (Ohio Geological Survey, Ohio Geology Newsletter, Spring 1986) pages 1+. and Pomeroy Rockfall: Again by Michael C. Hansen (Ohio Geological Survey, Ohio Geology Newsletter, Winter 1988) page 4.
This slide image included in the USGS National Digital Catalog for NGGDPP Grant G15AP00115 in FY2015.Context
Smooth and weathered rock cliff face. Rock fall in Pomeroy, Ohio.