Idioma:

Geochronology

Geer, Gerard De

Antiquity, 1928-09, Vol.2 (7), p.308-318 [Revista revisada por pares]

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Título:
Geochronology
Autor: Geer, Gerard De
Es parte de: Antiquity, 1928-09, Vol.2 (7), p.308-318
Notas: istex:16E6C78A77FF5365E05B8C3DBBFE83A9C4A48ED3
ark:/67375/6GQ-WG0F3161-B
ArticleID:00215
PII:S0003598X00002155
Descripción: 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.
Editor: Cambridge, UK: Cambridge University Press
Idioma: Inglés

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