James St. John:
Glomeroporphyritic-textured igneous rock 1
James St. John:
Glomeroporphyritic-textured igneous rock 2
James St. John:
Glomeroporphyritic basalt (Yachats Basalt, Upper Eocene, ~36-37 Ma; Heceta Head beach, coastal Oregon, USA) 1
James St. John:
Glomeroporphyritic basalt (Yachats Basalt, Upper Eocene, ~36-37 Ma; Heceta Head beach, coastal Oregon, USA) 2
James St. John:
Glomeroporphyritic basalt (Yachats Basalt, Upper Eocene, ~36-37 Ma; Heceta Head beach, coastal Oregon, USA) 3
James St. John:
Glomeroporphyritic basalt (Yachats Basalt, Upper Eocene, ~36-37 Ma; Heceta Head beach, coastal Oregon, USA) 4
James St. John:
"Greek Green Porphyry" (glomeroporphyritic metabasalt) (Tyros Beds, Triassic; near Levetsova, Laconia, Greece) 1
James St. John:
"Greek Green Porphyry" (glomeroporphyritic metabasalt) (Tyros Beds, Triassic; near Levetsova, Laconia, Greece) 2