The historic sandstone rock at Mammoth Cave
Mammoth Cave National Park; National Park Service
Showing work being done by CCC members at sandstone quarry, 1940
Mammoth Cave National Park; National Park Service
Showing work being done by CCC members at sandstone quarry, 1940
Mammoth Cave National Park; National Park Service
Close up view of inclusion in sandstone, from Forney Creek, 1936
Great Smoky Mountains National Park
I-G-GEN-1295, Natural Features - Geology - General Views,Sandstone, Inclusion in sandstone, from Forney Creek.
1936-06
Lithologic character of the St. Peter Sandstone and the Everton formation in the Buffalo River Valley Newton County, Arkansas
National Park Service Water Resources Division; National Park Service
