James St. John:
Big Clifty Sandstone over Girkin Limestone (Upper Mississippian; Dixon Cave Trail, Mammoth Cave National Park, Kentucky, USA) 1
James St. John:
Big Clifty Sandstone over Girkin Limestone (Upper Mississippian; Dixon Cave Trail, Mammoth Cave National Park, Kentucky, USA) 2
James St. John:
Big Clifty Sandstone over Girkin Limestone (Upper Mississippian; James Cave, near Park City, Kentucky, USA) 1
James St. John:
Big Clifty Sandstone over Girkin Limestone (Upper Mississippian; James Cave, near Park City, Kentucky, USA) 2
James St. John:
Big Clifty Sandstone over Girkin Limestone (Upper Mississippian; James Cave, near Park City, Kentucky, USA) 3
James St. John:
Big Clifty Sandstone over Girkin Limestone (Upper Mississippian; James Cave, near Park City, Kentucky, USA) 4
James St. John:
Big Clifty Sandstone over Girkin Limestone (Upper Mississippian; James Cave, near Park City, Kentucky, USA) 5
James St. John:
Big Clifty Sandstone over Girkin Limestone (Upper Mississippian; James Cave, near Park City, Kentucky, USA) 6
James St. John:
Big Clifty Sandstone over Girkin Limestone (Upper Mississippian; James Cave, near Park City, Kentucky, USA) 7
James St. John:
Big Clifty Sandstone (Upper Mississippian; entrance dale to Mammoth Cave, Kentucky, USA) 1
James St. John:
Big Clifty Sandstone (Upper Mississippian; entrance dale to Mammoth Cave, Kentucky, USA) 2
James St. John:
Big Clifty Sandstone (Upper Mississippian; entrance dale to Mammoth Cave, Kentucky, USA) 3