Carl Caldenius (1887–1961), until 1920 known by the surname Carlzon, was a Swedish Quarterany geologist and geotechnical engineer. He is mostly known for his geochronological work in Patagonia.Caldenius worked as geotechnical engineer for the Swedish State Railways until 1922 when he started to work full-time with his Ph.D thesis "Ragundasjöns stratigrafi och geokronologi" (Stratigraphy and geochronology of Lake Ragunda) that he defended in 1924.
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