446 BULLETIN 109, UNITED STATES NATIONAT; MUSEUM, 



Progress. — In 1874 the survey was begun in Venango and Butler, 

 in Clearfield and Jefferson, in Mifflin and Huntingdon, in York and 

 Adams, and in Lehigh Counties. 



In 1875 it was continued in those counties and was begiui in Greene, 

 Washington, and Allegheny, in Cambria and Blair, and in Tioga and 

 Bradford. A special survey of parts of Clinton was also made. 



In 1876 the survey of the oil region was made to include parts of 

 Warren and Crawford, Clarion and Armstrong. The rest of Alle- 

 gheny was surveyed, half of Westmoreland and Fayette, all Beaver, 

 half of Butler, all Somerset, Potter, and part of Snyder, and the sur- 

 vey of McKean was begun. The Lehigh work was extended into 

 Northampton and Berks, the York and Adams work into Franklin 

 and Cumberland. 



In 1877 the survey of the oil region and that of McKean were con- 

 tinued ; W^estmoreland, Fayette, and Butler were finished ; Lawrence, 

 Indiana, L^^coming, and Sullivan surveyed; the Blair County topo- 

 graphical survey extended ; the South Mountain topographical survey 

 continued ; the Nortliampton mountain and valley topographical sur- 

 vey extended into Berks; the survej'^ of Juniata begun; the topo- 

 graphical survey of the Seven Mountains in Snyder begun; the sur- 

 vey of Elk, Cameron, and Lancaster counties begun ; and the outcrops 

 of southern Bucks and Montgomery mapped and specimens collected. 



In 1878 the survey of the oil region was continued; Mercer, Clarion, 

 and Armstrong surveyed ; McKean completed ; Potter revised ; Juniata 

 revised and Perry surveyed; mapping in Blair finished; mapping of 

 the Seven Mountains continued; nuipping of the South Mountains 

 continued ; mapping of the Reading mountains continued ; Lancaster 

 completed; southern Bucks and Montgomery mapped; and the mu- 

 seum arranged and catalogued. 



In 1879 the survey of the oil regions was continued; Crawford, 

 Erie, Jefferson, and Clinton were surveyed; the Elk and Cameron 

 survey was extended into Forest, and the work in all three countie-s 

 completed; the Franklin County valley was surveyed; the South 

 Mountain topography continued; the Reading Mountain survey ex- 

 tended westward; the survey of the Philadelphia belt extended into 

 Delaware County; and Chester County surveyed. 



In 1880 the survey of the oil region was continued ; the Coal Flora 

 (collected, studied, described, and figured by Mr. Lesquereux since 

 1874) was published; the descriptions of the coal plants of Greene 

 County were published; the subject of waste in anthracite coal was 

 studied; Susquehanna and Wayne Counties were surveyed; the South 

 Mountain topography was continued ; the Cumberland County valley 

 was surveyed ; and the study of anthracite geology and mining meth- 

 ods begun. 



