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Published May 03, 2010, 03:39 PM

Just how permanent rock picking is depends on several variables

FARGO, N.D. — Just about every farmer in Agweek country might have had the chance to pick field rock in their lifetimes. Kenneth Lepper, a geologist at North Dakota State University in Fargo, notes that much of the Upper Great Plains and Midwest were glaciated in the so-called Quatemary period, 10,000 years to 2.6 million years ago. The most abundant sediment is called “till,” which is fine-grained but contains cobbles and boulders — field rock.

By: Mikkel Pates, Agweek

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