Saint Peter sandstone

Saint Peter sandstone

[′sānt ′pēd·ər ′san‚stōn]
(geology)
An artesian aquifer of early Lower Paleozoic age which underlies part of Minnesota, Wisconsin, Iowa, Illinois, and Indiana.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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