The geology of Hardin County, and the adjoining part of Pope County . ved, thereare unmistakable evidences of unconformity, and it is safe to assume thatthis relation is general. The upper contact of the Shetlerville formation has been observed infewer sections than has the basal contact. In the northeastern of the twohills between Rosiclare and Fairview what may be the line of demarcation 136 GEOLOGY OF HARDIN COUNTY between this formation and the superjacent Eenanlt is very sharp anduneven (see figure 10), clearly indicating an uncomformable relation be-tween the two beds, with an erosion in
The geology of Hardin County, and the adjoining part of Pope County . ved, thereare unmistakable evidences of unconformity, and it is safe to assume thatthis relation is general. The upper contact of the Shetlerville formation has been observed infewer sections than has the basal contact. In the northeastern of the twohills between Rosiclare and Fairview what may be the line of demarcation 136 GEOLOGY OF HARDIN COUNTY between this formation and the superjacent Eenanlt is very sharp anduneven (see figure 10), clearly indicating an uncomformable relation be-tween the two beds, with an erosion interval intervening between the twoperiods of sedimentation. Although this contact is obscured in all othersections which have been observed, the fact that the seeming unconformityis so pronounced at one locality suggests that it may be general, althoughno proof exists that this may be more than a local phenomenon. PALEONTOLOGY The Shetlerville formation is one of the most fossiliferous zones in theentire Chester group in Hardin County. In places where the shale and. Fig. 10.—View showing the possible unconformity between the Shetlervilleand the overlying Renault limestone, in the Ohio River bluff a third of a milebelow Rosiclare, looking northwest. limestone beds of the formation are exposed in open glades upon some ofthe hill slopes, well-preserved, clean fossils may be collected in larger number of the fossils met with belong to a comparatively fewspecies, but associated with these abundant or common forms there aremany others which are more or less rare in their occurrence. A combinedlist of the species from eight different localities in Hardin County, Illinois,and Crittenden County, Kentucky, from which fairly complete collectionshave been secured, includes 69 species. The combined list is given below,the occurrence of the species being indicated by crosses in the eight columnsnumbered 1 to 8 for the several localities. The localities from which thecollection
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectgeology, bookyear1920
