Until shortly after World War II, some stable, long-term professional careers were available to graduates holding only the Bachelor of Science degree, but after World War II a graduate degree became a necessity. This stemmed largely from: (1) increasing professionalism of geological science, (2) loss of curriculum time at the undergraduate level due to the need for enhanced cognate science and mathematics backgrounds, and (3) an increase in college requirements which consumed additional undergraduate program time. Thus, paradoxically, although the number of options for specialization in its undergraduate concentration program increased, the department began to discourage early specialization, preferring to emphasize a "core" program which left specialization to the graduate level. Teaching at the graduate level, and faculty and graduate student research in geology and to some extent in mineralogy, still were largely descriptive and field oriented in 1940. Subsequently, interests shifted to a more balanced mixture of field, laboratory, and theoretical studies. A marked growth occurred after about 1970 in research funded by outside agencies. This was largely due to increasing interest in such fields as geophysics, ore deposits, and petrology, where relatively higher funding levels prevailed. Global interests were incorporated in research, especially in the late 1960s and early '70s with the upsurge of interest in the plate tectonics concept. Growth characterized certain departmental graduate programs. Geophysics came to include work in seismology heat flow, and paleomagnetism. Seismological capabilities had existed at the University, as part of astronomy programs, prior to 1941, but in that year a Seismological Observatory, eventually becoming part of nation- and world-wide networks, was established in the Geology Department. Directors were J. T. Wilson (1941-58), J. M. DeNoyer (1958-64), H. N. Pollack (1964-68, 1971-76), P. W. Pomeroy (1968-71), and F. J. Mauk (1976-). The Paleomagnetics Laboratory was established in 1973, directed by R. Van der Voo.
The Subsurface Laboratory, begun in 1941 by Professor K. K. Landes and Dr. George V. Cohee of the U.S. Geological Survey, grew to include thousands of well records from the Great Lakes region, including mounted cuttings, slabbed cores, and drillers' logs. Its directorship passed to Professor L. I. Briggs in 1958. The majority of these records were put into a computerized information retrieval system