Nr. 6j KVARTÆR-STUDIKK I TKONDHJEMSFKLTKT 483 



(Bull. Minnesota Acad. of Sciences. Vol. IV, Xr. 2. 190(i. |)ag. oUO). 

 Prestwich ^was disposed lo limit Ihe duralion of Ihe Glacial 

 epoch to from 15,0(»(» lo 20, OUO years, including in Ihis eslimale 

 Ihe time during \vhich Ihe cold was diminishing, or Postglacial 

 time- (The Geol. Mag. London, D. o, Vol. 4, 1887, pag. H27), 

 og videre tilføier den samme forsker: The close of the Glacial 

 epoch, i. e. the final melting of Ihe ice sheet, mighl have laken 

 place from 8.000 to 10,000 'years since - (L. c. pag. :',28). Tal 

 lene er, som vi ser, temmelig vekslende, og de noget usikre an 

 skuelser finder et ganske godl tilsvarende utlryk i, hvad Fair 

 CHILD uttaler, at judging from the freshness of the glacial 

 scorings and Ihe deposils, 5,000 or 10,000 or 15,000 years is 

 Ihought hy many glacialists to be a fair eslimale of Ihe length 

 of thei rexposure. Bul uo reliable chronometer hasyet heen found 

 (The American Geologisl, Vol. XXII, 1898, pag. Iti). 



Følgende gir os el indblik i den maate, hvorpaa brittiske 

 archæologer og geologer behandler det geologiske lidsregnings 

 spørgsmaal. Keith slutler fra velkjendle archæologiske dala, al 

 den saakaldle F^ssex vvoman har en alder af ca. 4000 aar og 

 den saakaldle Tilbury man en alder af ca. 15000 aar vAncient 

 Types of Man, pag. 12). Den bekjendte engelske plantegeolog 

 (vLEMENT Reil) sier: Our next inquiry must be inlo Ihe length 

 of lime represenled by Ihe series of sui)merged foresis and asso 

 ciated deposils Fhe newesl of Ihem belongs cerlainly 



lo the age of polished slone, and the earliesl also probably 



comes Nvilhin Ihe Neolithic Period It is useless to prelend 



lo any exacl calculalions as lo Ihe lime needed for Ihe for- 

 mation of Ihese alternaling strata an allowance of 1000, 



or al mosl 1500, years would be ample lime lo allow - — 

 if this is approximalely correct Ihe dale al whicli Ihe subiner 

 gence began was only 5000 years ago < (.Submerged Forests, pag. 

 117). Og Robert MuNHo sier: Admitling thai no change of sea 

 level has laken place in Brilain during Ihe last 2000 years, Ihal 

 ihe rale of submergcnce bas beeii in Ihe same localilies of a 

 uniform characler, Ihal llie Fssex Womau lived aboul 4(«)0 years 

 ago. and Ihal eighl leet of land-submergeuce bas lakeii place 

 during Ihe 2000 years Ibis movemenl was in acliou, il follows 

 Ibal Ihe rale of submefgence al Wallonon Naze would be four 

 feel pei- lOOO vears. The same rale of submergcnce. if ;ipplicable 

 lo Ihe Thames Valley, would make Ibe Tilbury Mans age 10,000 

 years, and Ihal of Ihe commencemenl of Ihe Submerged l'orest 

 period 22,000 years Prebisloric Hrilain, pag. 2:'.2 -2:);) . 



Arthur Holmes, der ogsaa nylig har skrevel en inleressanl 

 oversikl The .\ge of Ihe Kartb . London 191:'.. ullaler: I)i; 

 Geer successfully allem|)le(l Ibe diHicull lask of counling the 



