Chap. 7] 



GRAVITATIONAL METHODS 



283 



by Gavat; for anticlines in Persia, by Jones and Davies.*^^ A recon- 

 naissance torsion balance survey across the Fort Collins anticline was 

 described by John Wilson "' 



That the torsion balance is ideally suited for the mapping of the topog- 

 raphy of basement rocks was first recognized by Eotvos himself, whose 



./'Iff 



Esptrscn 



South Uttrhf • Daqfon 



Fig. 7-114. Torsion balance gradient curves (measured and calculated) for the 

 Esperson-South Liberty-Dayton domes, with calculated section (after Barton). 



»ttJ43$?8tki 



Fig. 7-115. Gravity anomalies (calculated from gravity gradients) on the Egbell 

 and Sasvar domes (Czechoslovakia) (after v. Boeckh). 1. Pontian; 2. Sarmatian; 

 3. Upper Mediterranean; 4. Schlier; 5. Lower Neocene; 6. Paleocene and Triassic. 



classical observations in the Hungarian plain near Arad (begun in 1903 

 and continued in 1905 and 1906) are too well known to be reproduced in 

 detail. In the Midcontinent fields^*" the torsion balance has been used 



"^ See footnote 136. 



"' J. H. Jones and R. Davies, M. N. Roy. Astron. Soc, Geophys. Supp., 11(1), 

 1-32 (1928). 



"9 John Wilson, Colo. School of Mines Magazine, 18(8), 23 (Oct., 1928). 

 "0 D. C. Barton, A.I.M.E. Geophysical Prospecting, 416-466 (1929). 



