Geologic Timegreenspun.com : LUSENET : Introductory Geology, Oswego State : One Thread |
When rocks form do they have to form in the specific order of limestone being the oldest, shale in the middle and sandstone being the youngest, or can they form in different order?
-- Krista-Marie Cumberbatch (cumberba@oswego.edu), November 19, 2002