Zealand (1932–34). However, by the mid-1930s De Geer's teleconnections had become the subject of increasing criticism from his former student Ernst Antevs. Antevs correctly argued that the teleconnections were bad science, and that De Geer's Trans-Atlantic correlations were inaccurate. De Geer felt his position was being caricatured and intentionally misunderstood by Antevs, but did little scientifically to rebuff the criticisms levelled at him. In 1924 De Geer retired from teaching and became the founder-director of the Geochronological Institute at Stockholm University. Geochronologia Suecica Principles 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. Awards and recognition De Geer's contributions to geology were recognised in the UK, where the Geological Society awarded De Geer the Wollaston Medal in 1920, and the Royal Society elected De Geer a foreign member in 1930. The ancient DeGeer Sea in modern-day Maritime Canada was named in his honour. The Swedish Antarctic Expedition (1901–1904) named a glacier on South Georgia Island in the southern Atlantic Ocean after De Geer. The British would later rename the glacier Harker Glacier after a contemporary English geologist, Alfred Harker. The valley of De Geerdalen at Spitsbergen, Svalbard is named after him. De Geer from a modern perspective De Geer's most significant contribution to Quaternary science was unquestionably the identification of varves, and his recognition of their potential in establishing annual chronologies of past climatic and environmental change. The Swedish Time Scale was the most precise and accurate geological timescale of its day, and it is still being improved and added to today. His insistence that varves represented quantifiable proxies for past climate has since been borne out to a degree, but the relationship between varve thickness and hydrometeorological conditions is not