Annual Report for ... with Accompanying PapersPublished for the Iowa Geological Survey, 1941 - Geology |
Contents
INTRODUCTION | 9 |
PREVIOUS INVESTIGATIONS OF THE PLEISTOCENE GRAVELS OF IOWA | 23 |
THE DISTRIBUTION CHARACTERISTICS AND OTHER FEATURES OF | 35 |
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1/4 section 32 millimeters Adams county Afton Aftonian analyses average boulders carbonates cement cent centimeters in diameter clay colored Creek cross-bedding depth Douglas township drift area elevation erosion exposures feet thick figure Geological glacial glacier grades gravel deposits gravel is exposed gray gumbotil gumbotil plain horizon ice sheet Illinoian inches included interglacial Iowa Geol Iowan drift Iowan gravel iron oxide Kansan drift Kansan gravel Kansan gumbotil layer limestone loess Loveland Loveland gravel Mankato Mankato drift masses material Middle Nodaway River miles millimeters in diameter Mitchell county Nebraskan Nebraskan gravel Nebraskan gumbotil northwestern Iowa Oelwein overburden overlying peat pebbles Pennsylvanian Peorian Peorian loess Pleistocene pollen production Quarry quarter of section rocks sand and gravel shale Short tons shown shows silt slope soil stratified stream surface thin Tons Value Tons Total Union county unleached upland gravel upper valleys Value Tons Value Washington township weathered western Iowa