Ernst Cloos papers
- Cloos, Ernst, 1898-1974 (Person)
Conditions Governing Access
Collection is open for use.
Conditions Governing Use
13.76 Cubic Feet (6 record center cartons, 8 letter size document boxes, 4 legal size document boxes, 1 legal half-size document box, 1 flat box (15.5 x 12 x 3 inches), 1 flat box (11 x 9 x 3 inches), 1 custom box (14 x 10.5 x 4 inches), 1 custom box (10.5 x 8 x 5.5 inches))
Biographical / Historical
In the 1920s Cloos worked for Seismos, one of the first companies to apply seismic exploration to the discovery of oil. Cloos worked for them in Texas and Iraq. He returned to the United States in 1930 to do field work on the granitic rocks of the Sierra Nevada. In 1931 Cloos began his lifelong association with The Johns Hopkins University. Hired as a lecturer, Cloos was made associate professor in 1937, and full professor in 1941. He served as chairman of the Geology Department from 1952 until 1963 and retired in 1968.
While at Hopkins, Cloos began his productive study of the crystalline rocks of the Piedmont and Blue Ridge. Most of his important work was based on this study including "Geology of the 'Martic Overthrust' and the Glenarm Series of Pennsylvania and Maryland" with Anna Hietanen (1941); "Oolite Deformation in the South Mountain Fold, Maryland;" (1947) and "Microtectonics Along the Western Edge of the Blue Ridge, Maryland and Virginia" (1971).
In addition to his teaching and research, Cloos found time to serve as a consultant to several companies. His most extensive work was for the Thomasville Stone and Lime Company in Pennsylvania and the Humble Oil Company (later the Esso Production Research Company) in Texas. Cloos was involved in the Esso training seminar on structural geology where he taught his scale-model experiments using soft, wet clay. His scale-modeling sessions were the basis for his paper "Experimental Analysis of Gulf Coast Fracture Patterns" (1968). This paper won for him the American Association of Petroleum Geologists' President's award.
Cloos was quite active professionally. He belonged to many national and international geological societies and was especially active in the Geological Society of America and the National Academy of Sciences.
In 1923 Cloos married Margret Spemann. Cloos died May 28, 1974 and was survived by his wife and their two daughters Gisela (Mrs. W.R. Evitt) and Veronica (Mrs. F.C. Evering).
Scope and Contents
Some of the notebooks, research material and writings relate to Cloos's consulting work. There are notebooks, research and articles for his work for the Thomasville Stone and Lime Company and for the Humble Oil Company (later the Esso Research Production Company) in Oregon, Oklahoma, and Texas. Cloos also did consulting work (1948-64) for the Maryland firm Harry T. Campbell Sons' Corporation. This work was continued by Cloos's colleague Hans Eugster, and except for one report in Series 6, the materials are in Eugster's papers Ms. 209.
Cloos was quite active in the geological profession, but little of this is documented in the collection. Dr. Cloos's wife retained his correspondence, and it is likely the professional activities are outlined there. There is a small amount of material on the Geological Society of America (1966, 1968) and the National Academy of Sciences (1963, 1971-73) in Series 3. There are also a few items relating to committee work (1969-70) at Hopkins and a clay workshop (1968) he offered at the University of Georgia.
Cloos succeeded Joseph T. Singewald, Jr. as chairman of the Geology Department in 1952. The one file of Geology Department records which survived in Cloos's papers was correspondence relating to the history of the department compiled by Singewald for President Bowman in the 1940s.
Cloos's papers contain information on three of his colleagues. After Joseph Singewald's death, Cloos prepared "Memorial to Joseph T. Singewald, Jr." (1964). The materials in the Singewald series relate to compiling this memorial. Cloos also prepared a memorial for his close friend Robert Balk. The correspondence relating to this is in Series 1. In addition Balk's widow gave Cloos Balk's research papers. These have been removed to form a separate manuscript collection. Cloos also collected material about his brother Hans Cloos. Hans's reprints and letters are in Series 2.
Immediate Source of Acquisition
- Balk, Robert, 1899-1955
- Cloos, Ernst, 1898-1974
- Cloos, Hans, 1885-1951
- Crystalline rocks
- Esso Research and Engineering Company
- Geological Society of America
- Geology, Stratigraphic
- Geology, Structural
- Grabens (Geology)
- Humble Oil and Refining Company (Incorporated in Tex.)
- Johns Hopkins University. Department of Geology
- Maryland--Howard County
- Maryland--Montgomery County
- Maryland--Washington County
- National Academy of Sciences (U.S.)
- Pettijohn, F. J. (Francis John), 1904-1999
- Singewald, Joseph T. (Joseph Theophilus), 1884-1963
- Thomasville Stone and Lime Company
- Triassic Geologic Period
- United States
- United States--Blue Ridge Mountains
- United States--Piedmont Region
- United States--Sierra Nevada
Part of the Special Collections Repository
The Sheridan Libraries
3400 N Charles St
Baltimore MD 21218 USA