Pennsylvania Geology Final Report Volume 1 1981

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$\fdO'^ - Old Forge Coal Mines$

630 GEOl.OGICAL SURVEY OF PENNSYLVANIA. /. KX V/ I
thp: thickness of no. vii. 631 seen lying regularly upon the upper or roofing slate division of Formation No. Ill ; and we have been obliged in like manner to assume as the ui)per limit or top of No. IV, the highest massive white sandstone bed which presents itself at any given locality overlaid by the softer although still sandy reddish shale beds of No. V hereafter to be de- scribed. Very exact instrumental measurements of No. IV have been made in accordajice with this plan, that is, between such assumed bottom and top limits, in many parts of : <strong>Pennsylvania</strong> Water Gaps ; at the Delaware, Lehigh and Schuylkill at the Susquehanna gap above Harrisburg; at Rockhill gap near Orbi- at Logan gap near Lewistown ; sonia at the Bald ; Eagle gaps near Bellefonte and Tyrone City and at the ; gaps near Bedford. But as these measurements were made by different assistants of the Geological Corps they can be compared together only by making allowance for the inevitable differences of personal opinion respecting the best top and bottom limits of the formation. Yet, after all, these differences are so moderate as not to vitiate the conclusions drawn from the comparison ; and we have moreover on record for comparison the equally intel- ligent and conscientious measurements of the assistants of the First Geological Survey under Professor Rogers, which serve in a measure to check, and in fact help to verify their accuracy. The measurement of No. IV by Mr. Sanders in Blair county sums up 2896' ; that of Mr. Dewees at Logan gap in Mifflin county, 2722' ; that of Mr. Billin in the south of Centre county, 2440'; that of Dr. Chance in Clinton county, 2301' ; that of Professor White at Spruce Creek tunnel in Huntingdon county, 2000' (made uncertain by a fault); that of Mr. Ashburner in southern Huntingdon county, 1808' ; that of Professor Stevenson, in Yellow creek gap, Bedford county, 2035' (diminishing toward the Maryland line to less than 1000); and in Fulton county about 1600'; (according to Professor Rogers' estimate in Cove mountain 2100', and in Tussey mountain 1650'). In the Lycoming county gaps Mr. F. Piatt estimates it at 1375'. Dr. Chance's measurement at the Schuylkill AVater Gap was 1400' ; at the Lehigh
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GEOLOGICAL SURVEY OF PENNSYLVANIA.
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LETTER OF TRANSMITTAL. To His Excel
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LETTER OF TRANSMITTAL. V the top to
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YOL. I. TABLE OF CONTE^N^TS. Chapte
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TABLE OF CONTENTS. ix Chapter. Paie
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TABLE OF CONTENTS. XI Chapter. Page
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TABLE OF CONTENTS. XIU Chapter. Pas
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Volume I. LIST OF ILLUSTRATIONS. Pa
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LIST OF ILLUSTRATIONS. X\'\l Page,
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LIST OF ILLUSTRATIONS. XIX Page. 66
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2 GEOLOGICAL SURVEY OF PENNSYLVANIA
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6 GEOLOGICAL SIJRVEY OF PENNSYLVANI
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10 GEOLOGICAL SUKVEY OF PENNSYLVANI
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12 GE0L0C4ICAL SURVEY OF PENNSYLVAN
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14 GEOLOGICAL SUKVET OF PENNSYLVANI
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106 GEOLOGICAL SURVEY OE PENNSYLVAN
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110 GEOLOGICAL SUKVEY OF PENNSYLVAN
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118 GEOLOGICAL SURVEY OF PEISTNSYLV
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170 GEOLOGICAL StJRVEY OF PENNSYLVA
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180 GEOLOGICAL SURVEY OF PENNSTLVAl
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186 GEOLOGICAL SURVEY OF PENI^SYLVA
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202 GEOLOGICAL SURVEY OF PENNSFLVAN
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234 GEOLOGICAL SURVEY OF PENIfSYLVA
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240 GEOLOGICAL SURVEY OP PENNSYLVAl
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284 GEOLOGICAL SUKVEY OF PENNSTLVAN
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•2SS GEOLOGICAL SUETET OF PEXXSYL
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808 GEOLOaiCAL SURVEY OF PENNSYLVAN
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364 GEOLOGICAL SURVEY OF PEISTN'SYL
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372 GEOLOGICAL SURVEY OF PENTfSYLVA
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384 GEOLOGICAL SURVEY OF PElSrNSYLV
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410 GEOLOGICAL SUEVEY OF PENNSYLVAN
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458 GEOLOGICAL SURVEY OF PENNSYLVAl
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464 GEOLOGICAL SURVEY OF PEiSrNSYLV
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474 GEOLOGICAL SUPwVEY OF PENNSYLVA
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480 GEOLOaiCAL SURVEY OF PENNSYLVAN
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506 GEOLOGICAL SURVEY OP^ PENNSYLVA
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524: GEOLOGICAL SURVEY OF PENNSYLVA
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530 GEOLOGICAL SURVP:Y OF PENNSYLVA
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.^34 GEOLOGICAL SURVEY OF PENNSYLVA
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536 gp:ological survey of Pennsylva
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55x5 GEOLOGICAL SURVEY OF PENNSYLVA
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562 GEOLOGICAL SURVEY OF PEiSINSYLV
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572 GEO].OGICAL SUKVEY OF PENNSYLVA
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700 MODEL OF PLICATIONS OF IV.
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702 MODEL OF TLICATIONS OF KO. IV.
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L PLEASE DO NOT REMOVE CARDS OR SLI
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Pennsylvania Geology Final Report Volume 1 1981

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