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29-Jun-2017 11:54

Boltwood joined the faculty at Yale and taught there for the rest of his life, serving from 1910 to 1927 as Professor of Radiochemistry.

The names of the stages or ages most often depend on city and regions where the rocks were found; this is why division names frequently vary on geologic time scale charts from different countries.

Boltwood's mother was not wealthy, but she was affluent enough to send him to private school and, befitting her social position, destined him to attend Yale, his father's college.

He entered Yale's Sheffield Scientific School in 1889 and upon completion of the three-year program took highest honors in chemistry.

Simply put, Smith proposed that the lowest rocks in a cliff or quarry are the oldest, while the highest are the youngest.

By observing fossils and rock type in the various layers, it was possible to correlate the rocks at one location with those at other locations.

The eon represents the longest geologic unit on the scale; an era is a division of time smaller than the eon, and is normally subdivided into two or more periods.



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