[2nsdammit]

So your mapping was all surface contours, or soil related. Nothing like this, I take it:
http://www.und.edu/instruct/mineral/101intro/grandcanyon/grandcan.htm

[editor-surveyor]

"So your mapping was all surface contours..."

You've just proven your lack of reading comprehension.

Can you map the contours of an aquifer on the surface? Can you map deposits of rock that are under from 30 to 60 feet of overburden from the surface? Do you have any idea why you even made such a stupid observation?