(Encyclopedia) Rogers, William Barton, 1804–82, American geologist and educator, b. Philadelphia, grad. William and Mary, 1822. He was professor of geology at William and Mary (1828–35) and at the…
(Encyclopedia) epoch, unit of geologic time that is a subdivision of a period. The Pleistocene and Holocene epochs, for example, are divisions of the Quaternary period. Epoch is also used to describe…
MacroevolutionMicroevolution and MacroevolutionIntroductionMicroevolutionSpeciationMacroevolution Whereas microevolution explains diversification on an individual level over relatively short…
(Encyclopedia) De la Beche, Sir Henry ThomasDe la Beche, Sir Henry Thomasdə lä bāsh, dĕləbĕshˈ [key], 1796–1855, English geologist. As a result of his private undertaking to prepare a geological map…
(Encyclopedia) David, T. W. E. (Sir Tannatt William Edgeworth), 1858–1935, Australian geologist and explorer, b. near Cardiff, Wales. David came to Australia in 1882 as an assistant geological…
Source: U.S. Dept. of the Interior, Geological Survey According to the theory of continental drift, the world was made up of a single continent through most of geologic time. That continent…
(Encyclopedia) Smith, William, 1769–1839, English geologist. Through direct observation as a canal-site surveyor, Smith made a systematic study of the geological strata of England and identified the…
(Encyclopedia) Murchison, Sir Roderick ImpeyMurchison, Sir Roderick Impeymûrˈkĭsən [key], 1792–1871, British geologist. He served in the Napoleonic Wars but after the peace turned his attention to…
(Encyclopedia) Logan, Sir William Edmond, 1798–1875, Canadian geologist. Educated in England, he managed (1831–38) coal mines and a copper smelter in Wales. In addition to making studies of clays…
