James St. John: Yellowstone River (Pompey's Pillar, Montana, USA) 1
James St. John: Yellowstone River (Pompey's Pillar, Montana, USA) 2
James St. John: Yellowstone River (Pompey's Pillar, Montana, USA) 3
James St. John: William Clark scratch signature on sandstone (25 July 1806) (Pompey's Pillar, Montana, USA)
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 1
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 2
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 3
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 4
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 5
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 6
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 7
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 8
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 9
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 10
James St. John: Sandstones (Lance Formation, Upper Cretaceous; Pompey's Pillar, Montana, USA) 11
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 1
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 2
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 3
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 4
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 5
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 6
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 7
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 8
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 9
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 10
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 11
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 12
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 13
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 14
James St. John: Lance Formation (Upper Cretaceous; banks of the Yellowstone River, next to Pompey's Pillar National Monument, Montana, USA) 15