. Report of progress 1874-1889, A-Z .. . ticed that though the intervals are repre-sented as being subject to great variations in thickness,the general parallelism of the measures is preserved, asas a thickening or thinning in one stratum is always com-pensated by a corresponding increase or diminution of theinterval above or below it. Thus, the Freeport Sandstoneranges from 36 to 60 feet in thickness, but this -variation isalways compensated by an opposite variation in the over-lying or underlying strata; so that the distance from theBreeport Limestone down to the Kittanning Upper Coal 16 V.
. Report of progress 1874-1889, A-Z .. . ticed that though the intervals are repre-sented as being subject to great variations in thickness,the general parallelism of the measures is preserved, asas a thickening or thinning in one stratum is always com-pensated by a corresponding increase or diminution of theinterval above or below it. Thus, the Freeport Sandstoneranges from 36 to 60 feet in thickness, but this -variation isalways compensated by an opposite variation in the over-lying or underlying strata; so that the distance from theBreeport Limestone down to the Kittanning Upper Coal 16 V. REPORT OF PROGRESS. H. M. CHANCE. bed, or to the Ferriferous Limestone, remains nearly con-stant. The section here given does not include all of the BradysBend Section. It is only carried down to the bottom ofthe Brookville Coal Bed, which at Bradys Bend lies about165 feet above low water in the Allegheny River. Thestrata beneath this bed belong to the Beaver River or Con-glomerate Series (No. XII). es | M 50 25 585133 30 40 3 26 14 Generalized Section of the Lower Productive Goal 70 Mahoning SS., sometimes containing Millerstown Coal, . . 0 to 70 Slate and shale, sometimesreplacing Mahoning SS 1 to 6 Freeport Upper Coal 5 to 20 Fireclay and shale ore balls, 0 to 5 Freeport Upper Limestone, 5 to 15 Fireclay with ore—Shale, . 0 to 4 Freeport (Summit) Ore,25 to 35 Freeport Upper Sandstone, \sometimes shale, . j 1 to 8 Freeport Lower Coal, \\ to 4 0 to 5 Shale or Fireclay, . 3 \ 0 to 2 Freeport Lower Lime, 2 ( 6540 to 60 Freeport Lower SS., 60 j 0 to 10 Shale or Slate, _ 0to 4 Kittanning Upper Coal, 10 to 3 1 to 3 Fireclay, _ 30 to 45 Sandstone and shale, . 46 1 to 4 Kittanning Middle Coal, 2 to 4 3 to 8 Fireclay, .... 5 j35 to 40 Shale, olive and blue, 35 j 1to 4 Kittanning Lower Coal, . V to 5 Fireclay, .... 3 ? to 20 Sandstone, sandy shale, 23 0to 3 Slab ore, 12 to 18 Sandstone and sandyshales, ferruginous, .
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Keywords: ., bookcentury1, bookdecade1870, booksubjectcoal, booksubjectgeology
