The American journal of science and arts . VeTiJiilionville. * In speaking of the boundary of the coal-field, I wish to be understood in gen-eral, as treating of its line of junction witli the niagncsian limestone. Whetherthe coal-beds run out against this rock, or are continued bcneatli it, no facts liaveyet been observed in this country sufficient to show. The extent of the magne- 144 Geology of Upper Illinois. Rockwell is situated on section fourteen, Avhich is next to thesection against which the canal terminates. The width of theIllinois valley varies in this vicinity from one to two mile
The American journal of science and arts . VeTiJiilionville. * In speaking of the boundary of the coal-field, I wish to be understood in gen-eral, as treating of its line of junction witli the niagncsian limestone. Whetherthe coal-beds run out against this rock, or are continued bcneatli it, no facts liaveyet been observed in this country sufficient to show. The extent of the magne- 144 Geology of Upper Illinois. Rockwell is situated on section fourteen, Avhich is next to thesection against which the canal terminates. The width of theIllinois valley varies in this vicinity from one to two miles. Itsbluffs, which are generally of naked rock, and nearly perpendicu-lar, are between one hundred and one hundred and twenty feet inheight. Their course and position with respect to the channel ofthe river, may be seen upon the accompanying map. The bot-tom of the river in the vicinity of Utica is solid rock, with whichalso the bottom-lands are underlaid at very partial depths. In-deed, the strata often attain the surface over considerable breadthsof the
Size: 2935px × 851px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookidamericanjournalo341838newh, bookyear1820
