. Report of progress 1874-1889, A-Z .. . , 2, 3, figs. 136,137,138, 201 Shenango Iron Companys Gas Well 204 Harbour Bridge Section, fig. 140, 207 Fredericks town Axis, 207 Nashua Section, fig. 141, 209 Pulaski Section, fig. 142, 210 Love Farm bore hole, fig. 143<z, 211 Greenfield bore hole, fig. 1435, 211 Middlesex Section, fig. 144, 212 Bethel Section, fig. 145, 213 Bethel Quarry Section, fig. 146, 214 Pacific Slope Section, fig. 147, 214 Dip of the Sharon Block Coal 215 Sharon Block Coal described, 216 Sharon Section, fig. 148, 218 Sharon Well drilled in 1877, 219 Chapter 2. The Conglomer
. Report of progress 1874-1889, A-Z .. . , 2, 3, figs. 136,137,138, 201 Shenango Iron Companys Gas Well 204 Harbour Bridge Section, fig. 140, 207 Fredericks town Axis, 207 Nashua Section, fig. 141, 209 Pulaski Section, fig. 142, 210 Love Farm bore hole, fig. 143<z, 211 Greenfield bore hole, fig. 1435, 211 Middlesex Section, fig. 144, 212 Bethel Section, fig. 145, 213 Bethel Quarry Section, fig. 146, 214 Pacific Slope Section, fig. 147, 214 Dip of the Sharon Block Coal 215 Sharon Block Coal described, 216 Sharon Section, fig. 148, 218 Sharon Well drilled in 1877, 219 Chapter 2. The Conglomerate Series (No. XII) and the Berea Grit or Third Mountain Sand, 221 List of Illustrations. Plate 1. Sections showing the Clarion coal split into two beds, Figure 2. Contoured geological map of Northern 3. Contoured map of Parker. Plate 4. Skeleton map showing anticlinals and 5. Map of the Beaver and Shenango 6. Profile section from Sharon to 7. Five Oil well records. •. PREFACE. The first part of the volume which is now published pre-sents the results of certain special topographical and geo-logical surveys made by Mr. Chance while acting as assistantto Mr. Carll in the Butler County Oil Region in 1876, andof the systematic detailed survey of the fifteen northerntownships of the county, which he was afterwards commis-sioned independently to make in 1878. In undertaking this survey he had the advantage of in-tercourse for consultation with Mr. Carll at the headquartersof the latter in Pleasantvillej where many of his illustra-tions were drawn; and his expressed opinions are there-fore in most respects those at which Mr. Carll had arrivedin the course of his study of the Oil Regions in 1874, 5 and6. But in some important particulars Mr. Chance arrivedindependently at views common to both. Mr. Carllsmanuscripts on the limits of the Conglomerate system, onthe ancient drainage of the country, on glacial drift, &c,w
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