Nr. 6] KVARTÆR-STUDIER I TRONDHJEMSFELTET 157 



at iaktta tre iitprægede linjesæt; ofte sees kun to, til sine tider 

 ogsaa en flerhet af mindre skarpt fremtrædende linjer. Klippe 

 terrasser og almindelige terrasser gaar mangesteds umiddelbart 

 over i hverandre; foran sæ'kkedale og botner sees ofte som ter- 

 rasser utformede moræ^ier. 



Archibald Geikie sier ogsaa, at »there are in Scotland three 

 strand-lines so conspicuous and so persistent that attention mav 

 be confined to them. From what has been taken to be their 

 average height above mean sea-level or Ordnance datum, they are 

 known respectively as the 100-foot, the 50-fool, and Ihe •25-fool 

 beaches« (The Quart. Journ. Geol. Soc. London, Vol. 60 (1904), 

 pag. XC). 



Med hensyn til bevægelser i jordskorpen, «crust of the earth« 

 (Davis: Physical Geography, 1900, pag. 91) uttaler Davis: there 

 can be no (juestion that such movements have repeatedly taken 

 place, and that they are even now in sIo\v progress< (L. c. pag. 92'. 



SuESS indtok et særegent standpunkt til spørsmaalet om den 

 relative forbindelse mellem hævning og sænkning af land og hav, 

 saaledes som vi kan læse i hans afhandling »Ueber die vermeint- 

 lichen siicularen Schwankungen einzelner Theile der Erdober- 

 flåche« (Verh. d. k. k. geol. Reichsanstalt, 1880, nr. 11, pag. 171 

 flg.), hvor han ganske neutralt kun taler om »Verschiebungen 

 der Strandlinie« og indfører betegnelserne positive & negative 

 forsky vninger (L. c. pag. 173). Slutresultatet af Suess' under- 

 søkeiser resumerer han selv i følgende: »Wir werden uns ent 

 schliessen miissen, auch die letzte Form der Erhebungstheorie, 

 die Doctrin von den siicularen Schwankungen der Continente, 

 zu verlassen'< (L. c. pag. 180). Der er en mulighet for, at Suess 

 har virket tilbake ikke saa ganske lite paa enkeltes opfatning af 

 forholdene selv i vort land; Ihi det lyder ganske besynderlig, naar 

 Karl Petteusen i sin afhandling om The slo^v secular Rise 

 or Fall of (kontinental Masses' (The Geol. Magazine, London, 

 D. 2, V. 6, 1879, pag. 298—304) sier: »the opinions of Mr. Bravais 

 are founded on erroneous suppositions, and that his conclusions 

 must be kept, at least for the j)resenl, apart from the range of 

 positive facts (L. c. pag. 301j. Gilbert sier, at > the minule 

 elements of orographic displacement are often paroxysmal, but 

 so far as observation informs us, the general i)rogress of such 

 changes is slow and gradual< (U. S. Geol. Surv., V. Ann. Hej) 

 1S83— 84, pag. 123). 



.LvMiESON var af den anskuelse, at the weiglil of the great 

 glacier had caused a depression of the norlliern region on which 

 it lay, and that afterwards, when the ice melted, the land. being 

 relieved from ils load, gradually rose again, so that the old beach, 

 whicli was formerly horizontal, now presents an upward slope 



