V . K i; po KT o 1' ruooKKss in 1S70. S vi>., pp. 232. Tlio (ieology of Clar- 

 ion CoTNTV, by EI. Martyii Chance, witli colored <;o()lo<^ical map of county, 

 a map of tlio Anticlinals and Oil Belt, a contoured ma[:! of the Old River 

 Ciiannel at Piirker, S3 local sections (ij^urod in llie text, and 4 page plates. 

 Price, $0 43 ; postage, ?0 12. 



PETROLEUM FIELDS. 



I. Ukpoht of Progress ix thk Vknanoo County District — 1874. By 

 .Tohn F. Carll. With observations on the Geology around Warren, by F. A. 

 Rjindall; an<l Notes on the Comparative Geology of North-eastern Ohio and 

 North-western Pennsylvania, and Western New York, by J. P. Lesley. Svo., 

 pp. 127, witli 2 itiKps, a long section, and 7 cuts in the text. Price in paper, 

 ?0 CO: postag*, ?0 05. 



I-. Rki'OKT of Progress, Oil Wklls, Records, and Levels — lS7()-7. 

 By .lohn F. Carll. Pp. 398. Published in advance of Report of Progress. III. 

 Price. ?0 (50 ; postage, ?0 IS. 



I'. Report of Progress— 1875 to 1S70. Geology of the. Oil Regions of 

 Warrex, Venango, Clarion, and Butler Counties, including surveys 

 of the Garland and Panama Conglomerates in Warren and Crawford 

 counties, and in Chautauqua covuity, New York, Avith descriptions of oil well 

 rig and tools, and a discussion of the preglacial and postglacial drainage of the 

 Lake Erie Country; with Atlas. With maps and charts of Oil Regions. 

 By John F. Carll. Price, ?2 30 ; postage, ?0 30. 



I'. Geological Report of Warren County and neighboring Oil 

 Regions, with additional oil well records — 1880-3. Bj' .John F. Carll, with 

 colored geological map of Warren county, two sheets of oil well sections, and 

 a map of the Warren oil region. 439 pages. Price, SI 12 ; postage, fO 20. 



J. Special Report on the Petroleum of Pennsylvania — 1874, itf 

 Production, Transportation, Manufacture, and Statistics. By Henry E. Wrig- 

 ley. To which are added a Map and Profile of a line of levels through Butler, 

 Armstrong, and Clarion Counties, by D. Jones Luciis: and also a Map and 

 Protile of a line of levels along Slippery Rock Creek, by J. P. Lesley'. S vo., 

 pp. 122; 5 maps and sections, opiate and 5 cats. Price in j)aper, ?0 75 ; post- 

 age, 50 06. 



K. Dunkard Creek Oil District, Greene county. By J. J. Steven- 

 son. (.See Reports Bituminous Coal Fields.) 



I/. Appendi.K II. A Report on the Use of Natural Gas in Iron 

 Manufacture. By John B. Pearse. (See Miscellaneous Reports.) 



Qi-. Description of Oil Measures in and adjacent to Lawrence 

 COUNTY. Ba' I. C. White. (See Reports Bituminous Coal Fields.) 



Q,'. Description of Oil Measures in and adjacent to Eire and 

 Crawford Counties. By I. C. White. (See Reports North-western Penn- 

 sylvania.) 



R. Description of the Bradford Oil District in McKean county, 

 with a reference to the probable position of the Oil Sands in Elk county. By 

 Chas. A. Ashburner. (See Reports Bituminous Coal Fields.) 



V-. Description of the Oil Measures in Clarion County. By H. 

 M. Chance. (See Reports Bituminous Coal Fields.) 



NORTH-WESTERN PENNSYLVANIA. 



Qi*. Report of Progress — 1879. The Geology of Erie and Crawford 

 Counties, with tables of Ijarometric lieights in each township, and notes on 

 the place of the Sharon Conglomerate in the Palaeozoic series. By I. C. 



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