GRI-001ARKOSE
GRI-002GABBRO
GRI-003TEPHRA
GRI-004CHERT
GRI-005COQUINA
GRI-006CINDER
GRI-007SCORIA
GRI-009HORNFELS
GRI-011LAPILLI
GRI-012CLAY
GRI-001 arkose
GRI-002 gabbro
GRI-003 tephra
GRI-004 chert
GRI-005 coquina
GRI-006 cinder
GRI-007 scoria
GRI-009 hornfels
GRI-011 lapilli
GRI-012 clay