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Geochronology

Published online by Cambridge University Press:  26 May 2015

Gerard De Geer
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Extract

In the American journal Science for 1920 mention was made of my plan for investigating certain laminated clays in North America. During a previous visit to that country in 1891 I had noticed, in several places, laminated clays, similar to late glacial melting sediments in Sweden ; these I had found, by long continued investigations, to represent the annual deposit from the melting water along the border of the retreating ice-edge. (Plate I). With the aid of a graphic method for the comparison of the sharply marked annual layers or varves, I had succeeded in identifying such varves from one point to another, and ultimately worked out a systematic plan for the elaboration of a continuous time-scale. (See page 309). This was mainly carried out in 1905-6 on the basis of field measurements made with the assistance of a number of able young geologists. During the following year this standard scale was completed at many points. I thus succeeded in tracing, step by step, the recession of the ice-edge and the immediately following progress of the clay varves over one region after the other, until the whole line from the south to the centre of Sweden had been traced.

Type
Research Article
Information
Antiquity , Volume 2 , Issue 7 , September 1928 , pp. 308 - 318
Copyright
Copyright © Antiquity Publications Ltd 1928

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References

BIBLIOGRAPHY

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