 a higher geological horizon, and therefore placed them above the dolomites of the northern part of the State, as the equivalents of the so called Lower Helderberg group. We are now, however, fully satisfied from a further examination of these Upper Silurian...  Proceedings - Page 164by American Association for the Advancement of Science - 1871Full view - About this book
 | American Association for the Advancement of Science - Science - 1871 - 454 pages
...sectionsof the State, to regard the silicious limestones of Southern Illinois ns the representatives of a higher geological horizon, and therefore placed...State, as the equivalents of the so called. Lower Hclderberg group. We are now, however, fully satisfied from a further examination of these Upper Silurian... | |
 | American Association for the Advancement of Science - Science - 1874 - 732 pages
...sections of the state, to regard the .silicious limestones of southern Illinois as the representatives of a higher geological horizon, and therefore placed...northern part of the .State, as the equivalents of the so-called Lower Helderberg group. We are now, however, fully satisfied from a further examination of... | |
 | American Association for the Advancement of Science - Science - 1874 - 736 pages
...sections of the state, to regard the silicious limestones of southern Illinois as the representatives of a higher geological horizon, and therefore placed...northern part of the State, as the equivalents of the so-called Lower Ilelderberg group. AVe are now, however, fully satisfied from a further examination... | |
 | Illinois State Geological Survey (1905- ) - Geology - 1910 - 470 pages
...siliceous limestones of southern Illinois as the representatives of a higher geological horizon. We, therefore, placed them above the dolomites of the...northern part of the State, as the equivalents of the so-called Lower Helderberg group. "We are now, however, fully satisfied, from a further examination... | |
 | Geology - 1910 - 496 pages
...southern Illinois as the representatives of a higher geological horizon. We, therefore, placed tlieni above the dolomites of the northern part of the State, as the equivalents of the so-called Lower Uelderberg group. "We are now, however, fully satisfied, from a further examination... | |
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