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This suggests that the immediate ancestor of Homo erectus was an early Homo habilis or , the search for early human fossils. Excavating in several caves, he found a hominid jaw fragment in 1890.

Thankfully, volcanic activity has occurred periodically in East Africa for about the last 30 million years and, has allowed us to use some powerful dating tools in geology.

He graduated in 1972, but remained at Iowa State for a one-year master's program in geology.

After briefly working for an oil company in Texas, he enrolled at the University of California, Berkeley, CA, for his doctorate.

“Geologists did engineering, math, physics, chemistry, and, of course, biology,” he says.

“Geology seemed the perfect place for me because I didn't have to make a choice; I could study all the sciences as well as engineering.” As an undergraduate in geology and chemistry, he did field work in the western United States and East Africa, experiences that were transformative for someone who had never seen oceans, mountains, or palm trees.

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