• Geologic groups by lithology (21 C)
• Geologic groups of Africa (3 C, 16 P)
• Geologic groups of Asia (1 C, 17 P)
• Geologic groups of Europe (2 C, 52 P)
• Geologic groups of North America (3 C, 23 P)
• Geologic groups of Oceania (9 P)
• Geologic groups of South America (4 C, 6 P)

A

• Geologic groups of Antarctica (3 P)

V

• Volcanic groups (2 C, 52 P)