in what sedimentary environment were these grains deposited?

The size, shape, and arrangement of grains in a sedimentary rock describes the texture of that rock. If the grains of quartz are sand-size, rounded, the surfaces are frosted, and they represent 99%+ of the grains in the sandstone, in what sedimentary environment were these grains deposited? a.) a beach b.) till c.) sand dunes d.) a river bed close to a granite mountain

Asked By: erin h - 8/3/2006
Best Answer - Chosen by Asker
I think you would choose C.) Sand dunes. The wind does a great job of sorting materials, creates a frosting on the grains as they collide with other quartz grains without being cushioned by water, and the rounding would indicate a fairly extensive transportion system.
Answered By: Not a perfect fool but trying - 8/3/2006
Additional Answers (3)
It could be A or C, but C is the better choice because frosting is usually indicative of eolian environments.
Answered By: QFL 24-7 - 8/3/2006
Probably sand dunes as an origin however sand dunes are certainly subject to moving & blowing to different locations where they might be deposited...
Answered By: Common Sense - 8/3/2006
I totally agree with everyone else that C is the answer!
Answered By: babyblue4ever_nc - 8/3/2006
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