Geology and Mineralogy. 61 



hiprlilv probable that glacial action hud much to do with tlie oriprinal 

 accuinuhition of tlu' rocky debris on the flanks of tlie Bhie llidge, 

 and in the Ap])alachian valleys beyond." 



Prof. Rogers further observes that there is a siliceous and argil- 

 laceous tbnnation in N'irginia, easily confounded with the finer drift 

 beds, which underrus the Tertiary, and is placed by him at the base 

 of the Cretaceous formation or top of the Jurassic ; that sections 

 are exposed in a deep railroad cut between Wasliington and Bal- 

 timore, and on the way to Wilmington; that it is seen beneath the 

 Cretaceous green-sand in Maryland, Delaware, and }sfiw Jersey, 

 and near Haltimore was found'bv Prof. Tyson to contain stnmps of 

 Cycads. When the Cretaceous and Tertiary are absent these beds 

 are (>asily confounded with the stratified drift. Its contact with the 

 superficial deposits was well presented in April, 1875, near Wash- 

 ington, at a cut at the extremity of 16th street, at the base of the 

 Columbian College Hill, and on 14th street where it ascends the 



By authority of the General Assembly 

 presented to the Legi 



..—The Geolo^acal survey of North Carolina 

 Prof.^K'err was comnu-nced in 1866. The report now is^u 



ler a j 



jg fund of the Survey." A second \olun 



The rei)ort commences with an introduct 

 In^ical Geography of the State. In the course of it the fact is 

 i-ought out tliat on the ,souf.h side of the rivers in eastern North 

 urolina there are usually bluffs and high banks, and on the noi'th, 

 vamps and low flats ; and that this is a feature also of eastern 

 outh Carolina. Further, the Miocene shell-beds were found only 

 n the south side of these large rivers. "The cause," according to 



ith mathematical demonstrations by Prof. Ferrel, that, "in 

 hatever direction a body moves on the surface ot the earth, 

 lere is a force arising from the earth's rotation which deflects it 

 ) the right in the Northern hemisphere, but to the left in the 



^tate imrae<liately west of its center and extending westward to in- 

 •iiuK- the Blue Uidge ; also (2) an area in central North Carolina 

 -uiniinsj; north-northeast from Raleigh, and some small areas in 

 hai \icinity, one of them to the south on the Cape Fear River; 



