The Pleistocene Deposits in Warren County Iowa
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Chamberlin, "The Classification of American Glacial Deposits, " Journal of Geology, Vol. Ill, p. 271.
30 THE KANSAN DRIFT 31 is not favored at this point. Here percolation downward through the Kansan is impossible and lateral movement is slow.
The pebbles and bowlders in the Kansan are of all sizes up to three and four feet in diameter. These very resistant bowlders are of light- colored granite, red quartzite, and greenstone, but the largest bowlders found are granites and red quartzites, not ...greenstones. Among the bowlders are dark granites which are soft through decomposition of ferromagnesian minerals. Where observed these lie in the weathered portion of the Kansan. The accompanying table will serve to illustrate a grouping of pebbles that may be found : Granite, not decomposed 39 Granite, decomposed 2 Quartzite, red 13 Quartzite, white 9 Quartz 2 Greenstone 22 Chert i Hornblende schist and other hornblende rocks not granite 2 Sandstone, foreign . . 4 Sandstone, local 5 Limestone i 100 Table of percentages of the different kinds of rocks among the pebbles of the Kansan drift found just south of the fairgrounds at Indianola (S.
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You can find similar books in the "Read Also" column, or choose other free books by John Littlefield Tilton to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Chamberlin, "The Classification of American Glacial Deposits, " Journal of Geology, Vol. Ill, p. 271.
30 THE KANSAN DRIFT 31 is not favored at this point. Here percolation downward through the Kansan is impossible and lateral movement is slow.
The pebbles and bowlders in the Kansan are of all sizes up to three and four feet in diameter. These very resistant bowlders are of light- colored granite, red quartzite, and greenstone, but the largest bowlders found are granites and red quartzites, not ...greenstones. Among the bowlders are dark granites which are soft through decomposition of ferromagnesian minerals. Where observed these lie in the weathered portion of the Kansan. The accompanying table will serve to illustrate a grouping of pebbles that may be found : Granite, not decomposed 39 Granite, decomposed 2 Quartzite, red 13 Quartzite, white 9 Quartz 2 Greenstone 22 Chert i Hornblende schist and other hornblende rocks not granite 2 Sandstone, foreign . . 4 Sandstone, local 5 Limestone i 100 Table of percentages of the different kinds of rocks among the pebbles of the Kansan drift found just south of the fairgrounds at Indianola (S.
What to read after The Pleistocene Deposits in Warren County Iowa?
You can find similar books in the "Read Also" column, or choose other free books by John Littlefield Tilton to read onlineMoreLess
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