. Report of progress 1874-1889, A-Z .. . 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,
. Report of progress 1874-1889, A-Z .. . 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, .. LOWER PRODUCTIVE COAL MEASURES. V. 17 0 to 5 Limestone (Buhrstone) ore, 1 0 to 22 Ferriferous Limestone. . 15 Scrnbgrass Coal, ?18 to 30 Sandy shales, . . 25) 2 to 7 Clarion Coal Bed, . 3 (? 30 1 to 3 Fireclay, .... 2)20 to 40 Soft shale or sandstone, . 25 0to 6 Brookville Coal Bed, (?) . 3 0 to 10 Fireclay or shale, about . 5Homewood Sandstone. Total 423 The figures bound by a vincula are those used in con-structing the accompanying section, Fig. 2. Several instrumental measurements at Bradys Bend gavea mean of 264 feet as the distance from the Freeport UpperCoal down to the Ferriferous Limestone. This tallies wellwith the results obtained by Mr. White, who gives, (see Q,page 39,) the distance from the Upper Freeport Coal to theFerriferous Limestone, as— At Kittanning, . 261 At New Brighton 263 At Smiths Ferry, 242 Throughout the district I have always found this inter-val greater than 250 and less than 265 feet. The thickness of the Lower Productive Series (countingin the Ma
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