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Joseph Barrell

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Joseph Barrell was an American geologist whose research addressed sedimentation, erosion, crustal structure, and the interpretation of geological time. In 1914 he developed a model distinguishing a strong outer lithosphere from a weaker underlying asthenosphere, terminology that became important to later explanations of isostasy and plate tectonics. He also argued that gaps in sedimentary sequences could represent long intervals of erosion or nondeposition, influencing modern stratigraphic reasoning.

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Who was Joseph Barrell?

Joseph Barrell was an American geologist who studied sedimentation, erosion, crustal structure, and geological time. He worked at Yale and was born in 1869 and died in 1919. [National Academy of Sciences](https://www.nasonline.org/wp-content/uploads/2024/06/barrell-joseph.pdf)

Why is Joseph Barrell associated with the asthenosphere?

In his 1914 work The Strength of the Earth's Crust, Barrell named the asthenosphere as a weaker zone beneath the stronger lithosphere. His model helped explain how Earth's crust could support relief while adjusting through isostatic movement. [Original 1914 paper](https://upload.wikimedia.org/wikipedia/commons/8/85/The_strength_of_the_earth%27s_crust_%28IA_strengthofearths00barrrich%29.pdf)

Did Joseph Barrell work for Yale or the US Geological Survey?

He worked with the US Geological Survey on studies including the Elkhorn Mining District in Montana. In 1903 he joined Yale, where he developed teaching in structural geology and spent much of his later career. [Joseph Barrell biography](https://www.encyclopedia.com/people/history/historians-miscellaneous-biographies/joseph-barrell)

What did Joseph Barrell contribute to the study of geological time?

Barrell published Rhythms and the Measurements of Geologic Time in 1917 and used sedimentation rates as part of his thinking about Earth's history. He also co-authored a revised North American geologic time table with Charles Schuchert in 1914. [American Journal of Science](https://opac.geologie.ac.at/ais312/dokumente/Schuchert_1914_RevisedGeologic.pdf)