JOHNSON: TALLULAH DISTRICT. 
247 
drainage by a capture which occurred at some remote period. The 
point of capture was a short distance below the junction of the Chat¬ 
tooga and Tallulah Rivers; the falls due to capture have been reduced 
nearly to grade in the weaker rock over which the Chattooga runs, 
while they still persist in the hard rocks crossed by the lower Tallulah. 
The cause of the capture was probably the advantage of a shorter 
course to the sea which the Savannah enjoyed, and by virtue of which 
it was able to reduce even its headwaters to a lower level than the 
upper Chattahoochee, and so to undermine and capture the latter. 
LITERATURE. 
Campbell, M. R. 
’ 96 . Drainage modifications and their interpretation. Part 2. Journ. 
geol., vol. 4, p. 657-678 (see p. 672). 
Compiled. 
’ 00 . Operations at river stations in 1899. U. S. geol. surv., water 
supply and irrig. paper, no. 36, (see p. 127). 
Davis, W. M. 
’ 01 . Current notes on physiography. [Review of “The geology of the 
Tallulah Gorge” by S. P. Jones.] Science, n. s., vol. 13, p. 871. 
’ 03 . The stream contest along the Blue Ridge. Bull, geogr. soc. Phil¬ 
adelphia, vol. 3, p. 213-244. 
Hall, W. C., and Hoyt, G. C. 
’ 05 . River surveys and profiles made during 1903. U. S. geol. surv., 
water supply and irrig. paper, no. 115, 115 pp. (see pp. 18-28, 34-39). 
(Plate 2, profile of the Tallulah River, and figure 2, profile of the 
Tugaloo, are erroneously labeled; see errata sheet accompanying the 
report.) 
Hayes, C. W. 
’ 95 . The southern Appalachians. Nat. geogr. monogr. 1, p. 326. 
Hayes, C. W., and Campbell, M. R. 
’ 94 . Geomorphology of the southern Appalachians. Nat. geogr. mag., 
vol. 6, p. 63-126, pi. 4-6. 
’ 00 . The relation of biology to physiography. Science, n. s., vol. 12, 
p. 131-133. 
Johnson, D. W. 
’ 05 . The distribution of freshwater faunas as an evidence of drainage 
modifications. Science, n. s., vol. 21, p. 588-592. 
Jones, S. P. 
’ 01 . The geology of the Tallulah Gorge. Amer. geol., vol. 27, p. 67-75, 
pi. 9-11. 
