Physical features of the Des Plaines Valley . A. Outwash terrace on Spring B. Fraction run above Dellwood Parle. r v*^ «. ^ m ? A « . ^VAV.^A J GOLDTHWAIT] GLACIAL AND INTER-GLACIAL DEPOSITS. 43 This shows eight feet of tlie rock, with the lower limit not exposed. Thisexposure is about seven miles north-northeast of the Bush creek outcrop,and four miles north of the one at Spring creek. Talus, which appearsin the bluff still farther north, near Eomeo, looks suspiciously like thecemented conglomerate. Eeports of a hardpan underlying the tillalong the line of the Chicago drainage can
Physical features of the Des Plaines Valley . A. Outwash terrace on Spring B. Fraction run above Dellwood Parle. r v*^ «. ^ m ? A « . ^VAV.^A J GOLDTHWAIT] GLACIAL AND INTER-GLACIAL DEPOSITS. 43 This shows eight feet of tlie rock, with the lower limit not exposed. Thisexposure is about seven miles north-northeast of the Bush creek outcrop,and four miles north of the one at Spring creek. Talus, which appearsin the bluff still farther north, near Eomeo, looks suspiciously like thecemented conglomerate. Eeports of a hardpan underlying the tillalong the line of the Chicago drainage canal, a mile or so east of Sum-mit^ suggest that the conglomerate covers even a wider area than thatmarked by the outcrops just mentioned. Doubtless as further searchis made the known extent of the formation will be greatly increased, aswell as the understanding of its origin. The following data concerningthe Spring creek exposure was collected by Mr. C. E. Decker. The conglomerate outcrops in a large artificial exposure beneath thetill of the Valparaiso moraine (See Plate 4,
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookidphysicalfeatures00gold
