GEOLOGY. 



233 



ena on tbe otbor liave become apparent, and a pnrely genetic taxonomy 

 of geology, designed wlso to inchKh' ;!^eograi)by, lias been i>ublisbetl 

 by McGee.* Altbougb tbis classification (;aii only be regarded as pro- 

 visional, it may be introduced in brief. It is as follows: 



Classificafioii of (/colonic processes. 



-^ 73 f I.— Dofor-^ Aiitt'cedciiK^Epeirogeni 

 Illation.^ Con!sc(iuent^Orogeuic. 



£l j^2.-Gra<lutiou, 



c M Elevation. 

 ) ( Depression. 



Deposition. 

 De<ii;ulation. 



<, Extravasation. 



\ (Antithesis of cxtrav.) 



1. —Vulcan ism 



,, »,. .• < Tjitbifaction 



^•-Alteration Decoinpositi 



position. 



",„,,,.,. ( Glacial construction. 



2 1 '^•— ^'IJiciation ^ Glacial destruction. 



-Wind action 



.'). — Vital acstion 



^ Wind construction. 

 \ Wind destruction. 



\ Various constructive and 

 I destructive! processes. 



(Tbe matter of tbis record is arranged in accordance witb tbe last 

 classification.) 



DEFORMATION. 



Tbe initial geologic movements (so far as may be inferred from tbe 

 present condition of tbe rocks of tbe eartb) were distortion or displace- 

 ment of tbe solid or solidifying crust in sncb manner as to produce ir- 

 regularities in tbe surface of tbe globe. Tbese are tbe movements in- 

 volved in mountain growtb and in tbe elevation of continents; tbey 

 have been in operation from tbe earliest eons recognized by tbe geolo- 

 gist to tbe i)resent time; and tbe advances in knowledge concerning 

 tbem include not only current observations upon tbe niovenu^nts now 

 in progress, but observations upon crumpled and otberwise delbrmed 

 strata, and also legitimate inferences concerning tbe causes of tbe 

 movements wbose (^tfects are reconled in tbese strata. 



It lias long been known tbat tbe waters of tbe Atlantic are advanc- 

 ing upon tbe New Jersey coast, in consequence not only of wave-cut- 

 ting, bnt akso of sinking of tbe laiul. So rapid indeed is tbe sinking 

 of tbe land, particularly towards Sandy Hook, tbat notable goograpbic 

 cbanges have occurred witbin tbe last hundred years, and the mining 

 of timber, wbicb grew ui)on dry land, but is now lodged among its 

 stumps many feet beneath tide level and buried bericatli tbe oceanic 

 and fluvial deposits, has become an industry of some? importance. The 



"Nat. Geog. Mag., vol. i, 1888, pp. 27-;$G; Geol. Mag., Decade 111, vol. v, \8i*», pp. 

 489-495. 



