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forgot the links again--need coffee
{{Geology Index}}
{{Geology Index}}
Oblique-slip fault
[[Oblique-slip fault]]
Obsidian
[[Obsidian]]
Octahedral coordination
[[Octahedral coordination]]
Oil field
[[Oil field]]
Oil shale
[[Oil shale]]
Old age
[[Old age]]
Oolite
[[Oolite]]
Opaque mineral
[[Opaque mineral]]
Ophiolite suite
[[Ophiolite suite]]
Orbit
[[Orbit]]
Ore
[[Ore]]
Ore mineral
[[Ore mineral]]
Original Horizontality, Principle of
[[Original Horizontality, Principle of]]
Orogenic belt
[[Orogenic belt]]
Orogeny
[[Orogeny]]
Oscillation ripple
[[Oscillation ripple]]
Outcrop
[[Outcrop]]
Outgassing
[[Outgassing]]
Outwash
[[Outwash]]
Oxidation
[[Oxidation]]
Oxidized element
[[Oxidized element]]
[[Category:Geology]]
[[Category:Geology]]