GEOLOGICAL AND NATURAL HISTORY SURVEYS. 447 



In 1881 the siirvc}' of the oil region was continued; Warren was 

 surveyed; Pilve, and jMonroe, and part of Carbon were surveyed; a 

 special paleontological survey of Perry and Juniata was begun ; and 

 a systematic iiune and surface survey of all the anthracite coal fields 

 was organized. 



In 1882 the anthracite surve}' was carried forward; Center, 

 Dauphin, Lebanon, Luzerne, Lackaw'anna, Columbia, Montour, and 

 Northumberland counties were surveyed; the Perry County paleon- 

 tology continued; the third and last volume of the Coal Flora pub- 

 lished; the Eeport on Methods of Coal Mining completed; and the 

 first sheets of the Anthracite Survey published. A special survey 

 along the Lehigh River was begun. 



In 1883 a special survey of the Monongahela River collieries was 

 made; the Clearfield County coal fields were resurveyed; Hunting- 

 don County was finished; the roofing-slate belt in Northampton, 

 Lehigli, and Berks was surveyed; the glacial moraine was traced 

 across the State: the survey of the anthracite fields was continued, 

 additional sheets published, and a special topographical survey of the 

 Wyoming coal field commenced. The hand atlas of counties was 

 prepared for publication. 



In 1884 the anthracite survc} .s were continued, and sojue unfinished 

 work in other parts of the State undertaken. 



In 1885 there remained still unaccomplished a necessary revision 

 of parts of Forest, Tioga, Bradford, Union, and Snyder, and of the 

 whole of Juniata; a survey of the Pinegrove-Orwigsburg Valley; 

 some special local surveys in Cumberland, Dauphin, Lebanon, and 

 Bucks; a systematic survey of the Mesozoic country in Berks. Mont- 

 gomery, and Bucks, and some important local surveys in Chester 

 and Delaware, before the final preparation of the remaining volumes 

 of county reports could be published. 



As the appropriation of 1885 was reduced to about one-half, and 

 as a new survey of the oil, gas, and bituminous coal region of the 

 western counties was called foi' by the act, the things above mentioned 

 had to be postponed and a new disposition of the force of the survey 

 m.ade. The operations of the anthracite work had to be restricted 

 within narrower limits and several of the assistants resigned. 



In 1886 the anthracite survey was continued; the gas wells were 

 studied ; a more detailed survey of the anticlinal and synclinal struc- 

 ture of the Pittsburgh coal fields made; special features of the Cum- 

 berland Valley studied ; the maps of the water department of Phila- 

 delphia used for differentiating the Trias across the interval between 

 the Delaware and Schuylkill Rivers; collections made from the Silu- 

 rian limestone beds on the Schuylkill for microscopic examination: 

 136075—20 30 



