Baron Gerard Jacob De Geer was a Swedish geologist who made significant contributions to Quaternary geology, particularly geomorphology and geochronology. De Geer is best known for his work on varves. In 1890 De Geer was the first to apply the name Ancylus Lake to the Baltic paleolake discovered by Henrik Munthe. He subsequently participated in the protracted scientific controversy surrounding this lake.
- Occupation
- geologist, politician
- Position held
- member of the Second Chamber, rector
- Citizenship
- Sweden
- Born
- October 2, 1858
- Died
