James St. John:
Agate nodule (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 1
James St. John:
Agate nodule (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 2
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 1
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 2
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 3
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 4
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 5
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 6
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 7
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 8
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 9
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 10
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 11
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 12
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 13
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 14
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 15
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 16
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 17
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 18
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 19
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 20
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 21
James St. John:
Agate (Borden Formation, Lower Mississippian; eastern Kentucky, USA) 22
James St. John:
Agate (Estill County, Kentucky, USA) 1
James St. John:
Agate (Estill County, Kentucky, USA) 2