Lesley.] 5^" [Jan. 19, 



Northampton (commenced in 1875, and completed in the spring of 

 1883), inchides that part of Berks county lying east of the Schuylkill, 

 ^vith the hills west of Reading (by E. V. D'Invilliers). The sheets of 

 this map are all printed, and will be published shortly in the Atlas to 

 Report D 3 (1883). The report on Berks county will be published after 

 further work has been done in the county. 



Blair. Surveyed in 1877 by F. Piatt. See Report with Atlas T 

 (1881). The topographical map of Morrison's Cove, Canoe valley and 

 Sinking valley, with the Frankstown and Hollidaysburg region, reach- 

 ing to the summit of the Allegheny mountain at Galitzen, was com- 

 menced by R. H. Sanders in 1875 and completed in 1877. See the Atlas 

 to Report T. Note. — The delay in publishing this report was caused by 

 the necessity which arose of detailing the assistant geologist for work 

 in various other counties, which required immediate attention in view of 

 the publication of their rejwrts. 



Bradford. Surveyed in 1874 by A. Sherwood. See Report on Brad- 

 ford and Tioga counties, G (1878). Note. — The delay in publishing was 

 caused by the fact that Mr. Sherwood was ordered to confine his attention 

 to the rocks below the coal. In 1877 Mr. F. Piatt reported on the coal 

 basins, and Report G was then published. Subsequent work by I. C. 

 White and E. W. Claypole has discovered such considerable errors in the 

 survey of 1874 that a revision of the whole eastern and middle parts 

 of the county, north of Towanda creek, should be made. 



Bucks. The southern belt of the county was surveyed in 1879 and 

 1880 by C. E. Hall. See Report on Philadelphia county and the southern 

 parts of Montgomery and Bucks, C 6 (1881). This report gives a detailed 

 description of all the rocks of the county south of the red shale countrj'. 

 The northern edge of the county has been included in the Atlas sheets of 

 the topographical map of the South mountains (Reading and Easton 

 range) about to be published with Report D 3 on Northampton county 

 (1883). The largest part of B\icks county has not yet been surveyed. 



Butler. Southern half surveyed in 1876 by I. C. White. See Report 

 on Beaver, and parts of Allegheny and Butler counties, Q (1877). 

 Northern half surveyed in 1878 by H. M. Chance. See Report on North- 

 ern Butler, V (1878). 



Cambria. Surveyed in 1875, by F. and W. G. Piatt. See Report on 

 Cambria and Somerset District, Part 1, Cambria, H 2 (1877). 



Cameron. Surveyed in 1878, 1879 by C. A. Ashburner and A. W. 

 Sheafer. Tlie report on Cameron, Elk and Forest was partly printed in 

 1881 ; but the publication was stopped by the transfer of the geologists to 

 the Anthracite region, for organizing that survey. In 1883 there will be 

 a revision of the work done in these three counties, and the Report R 2 

 will then be published. 



