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Posted in response to Help Identify WI Rock from Daren on July 23, 2008 at 07:58:07:

Re: Help Identify WI Rock

Hi Daren,

This rock appears to be embedded with angular fragments of other rocks making it a breccia, which is a type of sedimentary rock. The large angular clasts in breccias indicate they consolidated relatively close to the clast source(s). With further transport and rounding of the clasts, breccias grade into conglomerates. When the clasts become sufficiently worked down and rounded by long transports before consolidating, conglomerates grade into coarse sandstones.

Glaciers do not sort transported materials like running water, so fragments of consolidated deposits of glacial till can also be chaotic and similar in appearance to breccias.

From Bob Keller - July 24, 2008 at 09:43:29

Message: 66782

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