. First century of national existence; the United States as they were and Shales, calcareouaaod arenaceous. f^^m 60 to 70 Calcareous andabalv beds, slatyaamiiituue, Ac Green and olive ahklek 150 to 200 Greenlakelate A sandstone. /■-> - iil to U Gray mica- ^=^ -■ - ^i-l ceoua sandstone. ■ - • - «en, pnrole, •rown shale. I to & Limeatona. 7^40 to 80 Sandstone A^ green shale. ssm 70 to Slates, shale^and sandstones. Upr Freeport to 7 Limestone. W to 40 Slate andslaty aauilstone. 3 Lower Freeport coatoften cannel. 60 to 60 Massive sand,stone. 15 Slat«, shale, or sandistone
. First century of national existence; the United States as they were and Shales, calcareouaaod arenaceous. f^^m 60 to 70 Calcareous andabalv beds, slatyaamiiituue, Ac Green and olive ahklek 150 to 200 Greenlakelate A sandstone. /■-> - iil to U Gray mica- ^=^ -■ - ^i-l ceoua sandstone. ■ - • - «en, pnrole, •rown shale. I to & Limeatona. 7^40 to 80 Sandstone A^ green shale. ssm 70 to Slates, shale^and sandstones. Upr Freeport to 7 Limestone. W to 40 Slate andslaty aauilstone. 3 Lower Freeport coatoften cannel. 60 to 60 Massive sand,stone. 15 Slat«, shale, or sandistone. 3 to4 Kittanningcoal 30 Slate, shale, oi to 6 Iron ore,15 Ferriferous lime. 30 Slate and shale. ^* 3 to 4 Clarion coaL _, -^zi:^ ;25 Slate and shale. i=t^ I . - I ■MKMSiaBMi to 2 Itrookvillacoal. ■77^ ^ih--- Mercer or lioneata co«l. ^Coal 1Cool 60 to 60 Massive sand-elone. S to 1h Brown A black to4 15 Shale and sand- 16 Shale and sand- 15 Shale and saiid-8 lone. 15 Shale and sand-stone. 100 Sandatone 20 Slaty to 4 Sharon eoaL 131 bers of the column will then be broughtinto view at the base of the hills. Thus, atPittsburg, the hills opposite the city afforda section of 300 or 400 feet, and the markedstratum is here the great coal-bed, which upthe Alleghany river toward the north risesto higher and higher levels in the hills, andtoward the south, up the Monongahela, sinksto lower levels, till it passes beneath the bedof the stream. By extending these obser-vations over the coal-field, it is found thatthe whole series of strata maintain theirgeneral arrangement, and the principal mem-bers of the group, such as an important coal-bed, a peculiar bed of limestone, etc., may beidentifitd over areas of thousands of squaremiles. It is thus the sections have been pre-pared at many localities to complete theseries, as presented on the opposite page,of the bituminous coal-measures of the ex-treme western
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Keywords: ., bookauthorhodgejam, bookcentury1800, bookdecade1870, bookyear1874
