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In page Pierre Teilhard de Chardin:

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Teilhard spent the periods between 1926-1935 and 1939-1945 studying and researching the geology and palaeontology of the region. Among other accomplishments, he improved understanding of China’s sedimentary deposits and established approximate ages for various layers. He also produced a geological map of China.[2] It was during the period 1926-1935 that he joined the excavation that discovered Peking Man.[citation needed]