Discuss the suite of sedimentary rocks that forms on a passive margin with increasing distance

and water depth from the shoreline. What happens to this suite of rocks during a regression?
What happens during a transgression? What will be an ideal response?


The student should describe the sandstone-carbonate-shale assemblage. Sandstones form close
to shore, partly as the result of wave activity. Shales are deposited a bit further offshore and
result from deposition of suspended clay particles that float a greater distance from the shoreline.
During a regression, these facies move outward on the continent resulting in a distinctive vertical
sequence with carbonates overlain by shales, which are overlain by sandstones. During a
transgression, these facies move onto the continent resulting in a distinctive vertical sequence
with sandstones overlain by shales, which are overlain by carbonates.

Environmental & Atmospheric Sciences

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