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Baron Gerard de Geer and the Varves

Baron Gerard de Geer and the Varves

Tabea Tietz
On October 2, 1858, Swedish geologist Gerard Jacob De Geer was born. De Geer made significant contributions to Quaternary geology, particularly geomorphology and geochronology. But, he is best known for his discovery of varves. A varve is a seasonal coarse-fine layer of clay deposited in still water.The layers were produced by the annual melt-water sequence and can be used as a chronological evidence. Gerard de Geer – Family Background and Early Years Baron…
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geology
Arthur Holmes and the Age of the Earth

Arthur Holmes and the Age of the Earth

Harald Sack
On January 14, 1890, British geologist Arthur Holmes was born. Holmes pioneered the use of radiometric dating of minerals and was the first earth scientist to grasp the mechanical and thermal implications of mantle convection, which led eventually to the acceptance of plate tectonics. “There are few problems more fascinating than those that are bound up with the bold question: How old is the Earth? With insatiable curiosity men have been trying…
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history
Scaliger and the Science of Chronology

Scaliger and the Science of Chronology

Harald Sack
On January 21, 1609, French religious leader and scholar Joseph Justus Scaliger passed away. He is referred to as being one of the founders of the science of chronology, expanding the notion of classical history from Greek and ancient Roman history to include Persian, Babylonian, Jewish and ancient Egyptian history. “All divisions in religion arise from ignorance of grammar.” ― Joseph Justus Scaliger [8] Justus Scaliger – Early Years Joseph Justus Scaliger was born…
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philosophy
Denis Pétau and the Science of Chronology

Denis Pétau and the Science of Chronology

Harald Sack
On August 21, 1583, French Jesuit scholar Denis Pétau was born. Pétau, also known as Dionysius Petavius, was one of the most brilliant scholars in a learned age. Carrying on and improving the chronological labors of Joseph Justus Scaliger,[2] he published in 1627 an Opus de doctrina temporum. Denis Pétau – Early Years Denis Pétau was born at Orléans, where he had his initial education. He attended the University of Paris, where…
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