The geology of Hardin County, and the adjoining part of Pope County . 13. In a conformable geological succession one layer is deposited uponanother without any considerable lapse of time between the two depositions,and such a relation doubtless exists between some of the formations of theChester group. Between the deposition of the Kinkaid and the Caseyvilleformations, however, a very long time, perhaps millions of years intervened—all the time in fact required for the accumulation of the thousands of feetof rocks including many thick coal beds, that are present in the Appalachiancoal fields b
The geology of Hardin County, and the adjoining part of Pope County . 13. In a conformable geological succession one layer is deposited uponanother without any considerable lapse of time between the two depositions,and such a relation doubtless exists between some of the formations of theChester group. Between the deposition of the Kinkaid and the Caseyvilleformations, however, a very long time, perhaps millions of years intervened—all the time in fact required for the accumulation of the thousands of feetof rocks including many thick coal beds, that are present in the Appalachiancoal fields but wanting in the Illinois section. Just what was taking placein Illinois while this great thickness of rocks was accumulating farther east,is not fully known, but it is certain that the region was land during that timeor a large part of it. Rocks do not usually accumulate upon a land they are worn away from it and carried by the streams to the ocean 223 224 GEOLOGY OF HARDIN COUNTY NVINVA1ASNN34 NVIddlSSISSIIN cs .°2 Q H t tu *£(o o * s I s i. » o c B d a ft > £ -S 0) o CO W B ctf M a !>» > to 09 O Ph 3 b > CD > >. o CO J CI „ CD* CD Ci B Ph o T3 B Ci cl B Ci a o CD> cl B Ci ft T3 8 a> ft A to £ -1- ?f. w >> tfi ?-. ,0 01 B s 0) Oh -B cd .B X -(-J «W a> o h CM ft O CD a> o F-l to d Ci a> to o to ,ri +j ^2OS >» B -*-> 3 o CM a; H ,B B +j BO 0 o M) O d CI Ci p V a bJD o HH B to Ci +j B S B -B to Ci <v Fh be „ O ct 73 ,B p CD 1 «Ci •B lt ,__, d CO CG B 1-1 O o B ci cl (S fe .2 o .d to 03 82 PENNSYLVANIAN 225 or some other body of water where the transported material is deposited uponthe bottom to form new rock strata. Much might he written upon this sub-ject of unconformity but enough has probably been said to give the reader anunderstanding of what is meant by the statement that a great unconformityexists between the Kinkaid and the Caseyville formations. Pottsville Group The Pennsylvanian syst
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectgeology, bookyear1920
