GC-101B Quartzite
GC-104 Ferruginous
GC-104B Quartzite
GC-110 Quartzite
GC-117 Quartzite
GC-120
GC-128 Quartzite
GC-603 Slate
GC-602 Slate
GC-020B Rusty slate
GC-020B-LC
GC-007 Green slate
GC-306 Marble
GC-308 Marble
GC-307 Marble
GC-309 Marble
GC-201 Sandstone
GC-207 Sandstone
GC-206 Sandstone
GC-301 Marble
GC-310 Marble
GC-308 Marble
GC-401 Volcanic rock
GC-410 Volcanic rock