Time remaining:
Correlating lithologies/rock units by using fossils and rock characteristics

Geology
Tutor: None Selected Time limit: 1 Day

- how do you know which layers are key beds?

- why do some units exist in only a few sections

- how do you know what environments rocks in correlating represent

Oct 6th, 2014

http://en.wikipedia.org/wiki/Key_bed

u check this 

http://geologyclass.org/correlation_concepts.htm

Nov 2nd, 2014

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