822 



GEOLOGICAL SURVEY 



when in a very flat and jungly country, without the ghost 

 of a landmark on which to get bearings, constitutes a succes- 

 sion of puzzles not conducive to rapid progress. Several 

 hundreds of square miles of such country had to be traversed 

 to make sure that no valuable rocks had been overlooked. Of 

 all the Atlas sheets the author has had experience of, sheet 80 

 is certainly most in want of revision and correction. The 

 account of the survey results was given in a paper in the 

 records for 1879. 32 



The survey of the country south of the above area was 

 resumed by the author in the beginning of 1881 and is now in 

 progress, and will, it is hoped, be completed during the present 

 season and joined on to Mr. King's unpublished work in South 

 Travancore carried out in 1881. In 1880 was published 

 a Memoir on the Nellore Portion of Carnatic. 33 This memoir 

 includes the Nellore District, sc far as included in sheet 77 of 

 the Indian Atlas, the survey of which was carried out by the 

 late Charles 2E. Oldham in the northern, and by Mr. King in 

 the southern part of the areas in 1860 and following seasons, 

 together with a traverse by the writer from Gudur to the 

 foot of the ghats at Rapur and thence northward past Udaya- 

 giri into the northern taluks. The publication of this memoir 

 was delayed chiefly by the lamented death of Mr. 0. 2Ei. 

 Oldham and by the impossibility of determining till after the 

 completion of the survey of the Kadapa formation the age of 

 a large area of rocks of very obscure relationship in the very 

 centre of the district. More emergent duties elsewhere 



32 On the geological features of the northern part of Madura District, the 

 Pudukota State and the southern parts of Tan j ore and Trichinopoly Districts 

 included with the limits of sheet 80, &c, &c, by R. Bruce Foote, f.g.s. — 

 Records of the Geological Survey of India, vol. xii, 1879. 



33 The gneiss and transition rocks and other formations of the Nellore por- 

 tion of the Carnatic by William King, b.a., Deputy Superintendent, Geologi- 

 cal Survey of India. Vol. xiv, part 2, of the Memoirs of the Geological 

 Survey of India. 



