An important key to the Principle of Original Horizontality is that

it applies to igneous rocks only.

it applies to layers that have not been deformed or disturbed.

Superposition must be applied first.

this principle governed the formation of rock layers in the past, but does not apply to the present.

Question

An important key to the Principle of Original Horizontality is that

 it applies to igneous rocks only.

 it applies to layers that have not been deformed or disturbed.

 Superposition must be applied first.

 this principle governed the formation of rock layers in the past, but does not apply to the present.

richyw · Answer

wrong section. but lucky for you I am a geophysics major.

richyw · Answer

however I don't think any of those are correct.

richyw · Answer

it's certainly not A and not D. It doesn't apply to B (tilted rocks are still assumed to have been ORIGINALLY horizontal), hence the name. You also don't really need superposition, but I suppose to indicate the orientation of the bed you would need something like laminations or bedding planes. So I think the best bet would be C. Although I would ask your prof first...