[Reports volI-XIII] . Flg. 6. Sandstone in Gorge of KaskasMa Beds. Cheeter. tic clay-shales with thin calcareous bands above. Every-where over those portions of the upper Mississippi valley inwhich the Kaskaskia is absent, the Saint Louis rocks, as alreadystated, are weathered and deeply channeled, many gorges pass-ing downward even into the Keokuk, thus showing pretty con-clusively that these portions of the territory were actuallyabove sea level during a part of the Kaskaskia the northern shore line continued to move southwardafter the Kaskaskia epoch had begun, and perhaps e
[Reports volI-XIII] . Flg. 6. Sandstone in Gorge of KaskasMa Beds. Cheeter. tic clay-shales with thin calcareous bands above. Every-where over those portions of the upper Mississippi valley inwhich the Kaskaskia is absent, the Saint Louis rocks, as alreadystated, are weathered and deeply channeled, many gorges pass-ing downward even into the Keokuk, thus showing pretty con-clusively that these portions of the territory were actuallyabove sea level during a part of the Kaskaskia the northern shore line continued to move southwardafter the Kaskaskia epoch had begun, and perhaps even untilthe latter half of the interval had set in, is shown by the sue-. CHESTER BEDS. 75 cessive attenuations of the several beds and by the deeply ex-cavated ravines, where soon afterward were laid down the localsandstones and shales of the Coal Measures. In a number ofcases, at least, these hardened sand accumulations, lying innarrow gorges, have been regarded erroneously as local depo-sitions of Kaskaskia grit, intercalated in the shales and lime-_ ^ , stone. Furthermore, these ^!?v^ii:/S::;i!:-:^-:-:i consolidated sands containplant remains, and inasmuchas they have been consideredLimestotve. ?* as part of the Kaskaskia, it Fig. 7. Details of Juncture of Figure 6. is quitC probable that tMs will account for some of the reported discoveries of certainterrestrial floras in the rocks of the Mississippian series. Faunally, and especially stratigraphically, the Kaskaskia,as displayed everywhere over a broad area adjacent to the lineof the Mississippi river, appears separated from the Saint Louisfar more widely than any other two members of the entireL
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