Nr. 6] KVARTÆR-STUDIER I TRONDHJEMSFELTET 483 



(Bull. Minnesota Acad. of Sciences, Vol. IV, Nr. 2, 1906, pag. 300). 

 Prestwich >was disposed lo limit the duration of the Glacial 

 epoch to from 15,000 to 20,000 years, including in this estimate 

 the time during which the cold was diminishing, or Postglacial 

 time« (The Geol. Mag. London, D. 3, Vol. 4, 1887, pag' 327), 

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

 epoch, i. e. the fmal melting of the ice sheet, might have tåken 

 place from 8,000 to 10,000 years since« (L. c. pag. 328). Tal- 

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

 skuelser tinder et ganske godt tilsvarende uttryk i, hvad Fair- 

 CHILD uttaler, at »judging from the freshness of the glacial 

 scorings and the deposits, 5,000 or 10,000 or 15,000 years is 

 thought by many glacialists to be a fair estimate of the length 

 of thei rexposure. But no reliable chronometer has yet been found« 

 (The American Geologist, Vol. XXII, 1898, pag. 171). 



Følgende gir os et indblik i den maate, hvorpaa brittiske 

 archæologer og geologer behandler det geologiske tidsregnings 

 spørgsmaal. Keith slutter fra velkjendte archæologiske data, at 

 den saakaldte » Essex woman< har en alder af ca. 4000 aar og 

 den saakaldte »Tilbury man en alder af ca. 15000 aar (Ancient 

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

 Clement Reid sier: »Our next inquiry must be inlo the length 

 of time represented by the series of submerged forests and asso- 

 ciated deposits — — — The newest of them betongs certainly 

 to the age of polished stone, and the earliest also probably 



comes within the Neolithic Period It is useless to pretend 



to any exact calculations as to the time needed for the for- 

 mation of these alternating strata an allowance of 1000, 



or at most 1500, j^ears would be ample time to ailow 



if this is approximately correct the date at which the submer- 

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

 117). Og Robert Munro sier: »Admitting that no change of sea- 

 level has tåken place in Britain during the last 2000 years, that 

 the rate of submergence has been in the same localities of a 

 uniform character, that the Essex Woman lived about 4000 years 

 ago, and that eight feet of land-submergence has tåken place 

 during the 2000 years this movement was in action, it foUows 

 that the rate of submergence at Walton-on-Naze would be four 

 feet per 1000 years. The same rate of submergence, if applicable 

 to the Thames Valley, would make the Tilbury Man's age 10,000 

 years, and that of the commencement of the Submerged Forest 

 period 22,000 years« (Prehistoric Britain, pag. 232 — 233). 



Arthur Holmes, der ogsaa nylig har skrevet en interessant 

 oversikt »The Age of the Earth«, London 1913, uttaler: >De 

 Geer successfully attempted the difficult task of counting the 



