James St. John:
Arkose
James St. John:
Arkose (Fountain Formation, Pennsylvanian to Permian; Colorado, USA) 1
James St. John:
Arkose (Fountain Formation, Pennsylvanian to Permian; Colorado, USA) 2
James St. John:
Arkose (Newark Supergroup, Triassic-Jurassic; Mt. Tom, Massachusetts, USA) 1
James St. John:
Arkose (Newark Supergroup, Triassic-Jurassic; Mt. Tom, Massachusetts, USA) 2
James St. John:
Arkose (Newark Supergroup, Triassic-Jurassic; Mt. Tom, Massachusetts, USA) 3
James St. John:
Arkose (Newark Supergroup, Triassic-Jurassic; Mt. Tom, Massachusetts, USA) 4
James St. John:
Arkose (Newark Supergroup, Triassic-Jurassic; Mt. Tom, Massachusetts, USA) 5
James St. John:
Arkose (Newark Supergroup, Triassic-Jurassic; Mt. Tom, Massachusetts, USA) 6