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UT Geology Begins

J.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 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.

Learn more about Udden.


J.A. Udden
Johan August Udden
From a 1911 image from Leighton (1950)

Glass Mountains of West Texas
The Uddenites zone in the Glass Mountains

Careful annotations provide vital information about old photographs
From a photograph by F. B. Plummer in TMM archives


Frequently used abbreviations: NPL  Non-vertebrate Paleontology Laboratory | TNSC Texas Natural Science Center | UTDGS Department of Geological Sciences | BEG  Bureau of Economic Geology | VPL Vertebrate Paleontology Laboratory | JSG  Jackson School of Geosciences | SUPPORT | VOLUNTEER | GLOSSARY

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