Johan A. Udden (1859-1932)
M.A. Augustana College, Illinois
Joined the UT Mineral Survey in 1904, with permanent connection in 1911, and later became director of the Bureau of Economic Geology (BEG).
Pioneer in the use of well-cuttings and sedimentary petrography. Well-cuttings are obtained from wells as they are drilled. Udden recognized the relevance of those cuttings as indicators of the rock types being drilled.
Also an instigator of micropaleontology studies and one of the first to recognize their importance.
Responsible for significant work on the Permian period of the Glass Mountains in West Texas. Found Uddenites sp. a critical ammonite from the Glass Mountains.
Was knighted by the King of Sweden.
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