47 



no(5 öon bemfetBen faft gänstid^ cntBlögl ift. *• !DaBel ift 

 bie ^fiovbfiifte bcr Snfel in fleiDaltiger Sßelfe serriffcn, unt? 

 ein bcn Seifen ber Oftfüfte seigen fic^ Sel§fd)(iffe iinb gelö^ 

 fnrd^en in ^eri^orragenber SÖßeife. Söäl^renb aBer bicfc 

 2JJer!3eicI)en auf eine getüaltige SBafferflut^ ^intoeifen, trägt 

 bie 3nfe( sugleic^ bie itnDerfennbarften SO^erlmale plittoni'^ 

 frf;er Sll^ätigfeit an fic^.'- ©ag ic^ ijom ^Refultate biefer 

 llnterfucjungen überrafd^t U)urbe, tt)iö i(^ nic^t toer^e^Ien, 

 inbem id^ barin eine auf grünblic^er gorfdbung fc^arffin- 

 nicjer unb fad^funbigerSJ^Snnerru'^enbe^eftätigung meiner 

 5Infi(^t ijcn 3ufammenu?ir!en ^(utonifd^er unb neptunifc^er 

 Strafte bei ber jüngften aügemeincn unb großen SBeränbe* 

 rung ber (^rboberfläc^e, u>e(c^e id^ in ber ©c^rift: „bie 

 iüuQfte ^ataftrop^e be6 (Srbbatlö" auSgefprod^en ^atte, ju 

 finben glaubte, unb babei sus^eif^? erfu'^r, bag f(^on ®ana 

 auf bie Siorbenbilbung in l^ö^eren breiten Dor mir auf- 

 nterffam Qemadbt, unb an^ babei fd;on auf ben nörblid^en 



1. One of the most prominent features of Isle Royale, 

 which cannot fall to strike any traveller Coming from the south 

 shore, is the almost total absence of drift deposites — the shore 

 being everywhere composed of harren rocks, Ilep» P. I, p, 200. 

 ]. Isle Royale was formed during this epoch, and owes its 

 origin to submarine, volcanic agency, The main mass is traver- 

 sed by numerous ridges of bedded trap, of unequal hardness, 

 while the coast is intersected by deep passages, or fiords, like 

 those of Iceland and Norway. They undoubtedly originated 

 during the drift epoch, for we know that the waves of the sea, 

 as manifested along the coast at this day, are incapable of such 

 excavating power. Over the whole surface of the island, we 

 meet with mimerous evidences of powerful denudation. The 

 rocks have been ground down, polished, and striated, and near- 

 ly all of the superficial materials removed. In some instances, 

 isolated blocks remain as obelisks to remind us of the estent 

 of the desolatioa. Eep. P. II* p, 116* 

 / 



