J.P. Lesley on the ee 187 
ee ao ae 
at, then, are the thou ands of fect of rocks included in 
Dickiows Nos. 5, 6, 7, a oe: 8 of Logan’s great section? In 
other words, the 7630 foi over which Dawson climbed to reach 
the a of his “true go -measures 3?” 
_ himself, sometimes, that he is not riding through Lykens or Lo- 
_ eust or Catawissa or Trough Creek Valleys in Dbietcy what 
_ ever the chocolate-colored soils of No. XI.’ This formation, 
_ 000 feet thick around the southern Anthracite coal-fields, be- 
comes, indeed, thinner and thinner northwestward, until it is but 
. Disiica: N 0. 5 of Logan’ s section consists of red shales and 
_ sandstones chiefly, 2012 feet thick. There is no reason why this 
_ should on be the representative of Formation No. XI, or of its 
_ Up # 
a Tf it b f it be objected that Division 6 is in fact a coal system 
- with nine beds of coal and numerous bituminous limestones, 
objection becomes an additional. sequniett rm ‘the identifica- 
or we see in this No. 6 the reproduction, at this immense 
Pistarses, of the Lower or False Coal-measures of Virginia, 
Where a productive coal system underlies the chocolate shales of 
ponation No. XI, and not only reapp with workable beds, 
tern Kentucky and Middle oceaieas: ‘but projects _ 
: a recognizable shape, through Western Indiana near] 
_ Chicago, and through a Pennsylvani nearly to the og 
Ww ; 
rmations, used in these pages, are those Pharma used in 
the te Her oft ode! Geol surveys of Deapeania and Virginia, Prof. Rogers 
