- Johannes Herman Frederik Umbgrove
Johannes Herman Frederik Umbgrove (
February 5 1899 Hulsberg (Limburg) -June 14 1954 Wassenaar ), called in short Jan Umbgrove, was a Dutchgeologist and Earth scientist.Umbgrove studied
geology atLeiden University , he finished his studies in 1926. He then became employed as a paleontologist for the "Dienst van de Mijnbouw in Nederlands Indië" (Geological Survey of theDutch East Indies ), where he studiedTertiary foraminifera andcoral s. He also studiedvolcano es,tectonics ,coastal morphology and thebathymetry of the seas surrounding theSunda Islands .From 1929 he went back to
Leiden to become the assistant of his former teacher B.G. Escher. In 1930 he became professor instratigraphy and paleontology atDelft University . His research was again multidiciplinar. He studied thepaleogeography of the Dutch East Indies from the data acquired by the gravitational surveys of F.A. Vening Meinesz, the paleontology of corals andcoral reef s, tectonics, the geology of the Netherlands andvolcanology . Because of his broad field of interest he was one of the first to think of the Earth as one dynamic system, an idea on which he wrote his book "the Pulse of the Earth" in 1942. Another book on paleontology was published in 1943.When he turned seriously ill in 1952 he kept writing in his bed, until his death in 1954.
ources
*I.M. van der Vlerk & Ph. H. Kuenen, 1954: "levensbericht van Johannes Herman Frederik Umbgrove" in Geologie & Mijnbouw, vol. 16, p 339-346
*A.J. Pannekoek, 1962: "Geological research at the universities of The Netherlands, 1877-1962" in Geologie & Mijnbouw, vol. 41 no. 4 p. 161-174
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