Logan, Sir William Edmond

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 underlying coal seams, he made extensive geological maps and sections. These were used for the first geological map of Britain by H. T. De la Beche. As head of the Canadian Geological Survey (1842–70), Logan became known as the father of Precambrian geology. He was the first to recognize altered PaleozoicPaleozoic era
, a major division (era) of geologic time (see Geologic Timescale, table) occurring between 570 to 240 million years ago. It is subdivided into six periods, the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian (see each listed individually).
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 rock in S Canada and first to discover reptile remains from the Carboniferous periodCarboniferous period
, fifth period of the Paleozoic era of geologic time (see Geologic Timescale, table), from 350 to 290 million years ago. Historical Geology of the Period
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. He wrote, with T. S. Hunt, The Geology of Canada (1863).


See biography by B. J. Harrington (1883).