381 



oils stream would |ieniiit a loweriii.i; of tlie ixiadient wliere previous to 

 drajiia^^e ae<-essioii (lii' \aUe.\ had liecome soiiiewliat l.iroadened in a coiu- 

 liai-atividy graded condition. V>\i\ in aii.v case tiie adjustnicnt of tiie imrhod 

 triluitaries in tlio down stream diiecti 

 siblo factor determiniiii; tlie jiositicii i 

 an orifiin unlii<o any otiiers that liav 

 writer. So far as he is aware siicii 

 hef(U-e. 



It may be mentioned here that the ca.se of piracy here (leseril)e(l is one 

 of the same type as tliat of the famous Kaaterskill Creek of the eastern face 

 of tlie Catskill mountains, New York." The topographic conditions are 

 essentially the same except for masiiitude. Kaaterskill f'reek has taken 

 over about 12 scpiare miles of the head-water draiiuifie of Schoharie Creek, 

 the back-slope stream of the Catskill mountains cuesta. On tlie same 

 cuesta an adjacent scarp-stream. I^laaterskill Creek, has added some 5 



Fig. 6. — Bed-rock terrace northwest of the mouth of the barbed stream one- 

 half mile northwest of Borden. This terrace is an e.xample of those being formed 

 where the barbed streams come into ihe main stream. They are due to an adjust- 

 ment of the bapbed tributaries to the present reversed drainage line as downward 

 erosion is taking place. These terraces havi> an origin unlike any others known to 

 the writer. 



square miles to its drainage by successive piracy. Farther south. Sawkiil 

 Creek has stolen some 10 square miles from a westward flowing stream, but 

 this case is not a case of successive piracy. It was perhaps largely brought 

 about by glacial action. It will he re-called that Muddy Fork of Silver 

 Creek has added something like 'A'> sipiare miles to its drainage by succes- 

 sive piracy. 



i^For a brief descriotion of this piracy sei 

 Vol. VII. 189(>. pp. .505-507. Also. R. D. .S; 

 Surv.. Prof. Paper, 60, 190.S. pp. 49-50. 



X. II. I> 



.1 W 



1. Bull. G'eol. Soc. Amer.. 

 W. Atwood, U. S. Geol. 



