James St. John: Entrance steps to the Pass of El Ghor (Mammoth Cave, Kentucky, USA) 1
James St. John: Entrance steps to the Pass of El Ghor (Mammoth Cave, Kentucky, USA) 2
James St. John: Scallops (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 1
James St. John: Faulted limestones (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 1
James St. John: Faulted limestones (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 2
James St. John: Faulted limestones (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 3
James St. John: Fractured & faulted limestones (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 1
James St. John: Fractured & faulted limestones (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 2
James St. John: Fractured & faulted limestones (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 3
James St. John: Canyon passage (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA)
James St. John: Fractured & faulted limestones (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 4
James St. John: Gravel-filled paleo-pothole (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 1
James St. John: Gravel-filled paleo-pothole (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 2
James St. John: Gravel-filled paleo-pothole (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 3
James St. John: Gravel-filled paleo-pothole (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 4
James St. John: Vertical shaft (Black Hole of Calcutta, Pass of El Ghor, Mammoth Cave, Kentucky, USA) 1
James St. John: Vertical shaft (Black Hole of Calcutta, Pass of El Ghor, Mammoth Cave, Kentucky, USA) 2
James St. John: Scallops (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 2
James St. John: Scallops (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 3
James St. John: 1861 graffiti (Pass of El Ghor, Mammoth Cave, Kentucky, USA) 1
James St. John: 1861 graffiti (Pass of El Ghor, Mammoth Cave, Kentucky, USA) 2
James St. John: Vintage trash (Pass of El Ghor, Mammoth Cave, Kentucky, USA)
James St. John: Scallops (Ste. Genevieve Limestone, Middle Mississippian; Pass of El Ghor, Mammoth Cave, Kentucky, USA) 4
James St. John: Breakdown (Pass of El Ghor, Mammoth Cave, Kentucky, USA) 1
James St. John: Breakdown (Pass of El Ghor, Mammoth Cave, Kentucky, USA) 2
James St. John: Breakdown detachment site (Pass of El Ghor, Mammoth Cave, Kentucky, USA) 1
James St. John: Breakdown (Pass of El Ghor, Mammoth Cave, Kentucky, USA) 3
James St. John: Breakdown detachment site (Pass of El Ghor, Mammoth Cave, Kentucky, USA) 2
James St. John: Breakdown detachment site (Pass of El Ghor, Mammoth Cave, Kentucky, USA) 3
James St. John: Breakdown (Pass of El Ghor, Mammoth Cave, Kentucky, USA) 4