| Description |
v, 87 leaves : illustrations, maps, photographs ; 29 cm |
| Summary |
"A study of the mineralogy of the Grassy Creek and Saverton formations of Northeast Missouri was undertaken to determine whether a division is justified, as proposed by some stratigraphers, of these argillaceous beds into two formations. The formations were sampled systematically at surface exposures on the northeast limb of the Lincoln Arch in the vicinity of Hannibal and Louisiana, Missouri. The samples were investigated mineralogically in the laboratory. Previous studies showed that the fossils of the Grassy Creek and Saverton beds were virtually identical. The present study demonstrates that the Grassy Creek and Saverton beds are too near alike in mineral content and depositional environment to justify separation into two distinct formations. The diastem responsible for confounding stratigraphers into division of the beds into two formations was recognized as a relatively ephemeral, and in all probability local, feature. It is here proposed that the name Saverton for the upper beds be abandoned, and that the beds in their entirety be designated as the Grassy Creek formation"--Abstract, leaf 1. |
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