In 1940, De Geer published his longest and best-known work Geochronologia Suecica Principles, in which he presented part of the Swedish Time Scale in detail, and expounded upon his theories and work regarding varves.
Almost immediately after the publication of Geochronologia Suecica Principles De Geer's Swedish Time Scale underwent the first of many revisions, as other geologists became involved in the study of varves and more sites were examined.
However, international interest in varves diminished. The bitter dispute between De Geer and Antevs, coupled with the advent of new dating techniques, most importantly radiocarbon dating, showed varves in a bad light.
De Geer died in Stockholm on July 24, 1943. His wife, Ebba Hult De Geer, continued to publish his work, and add to it, into the 1950s.
Read more about this topic: Gerard De Geer
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