- Ebenezer Emmons
Ebenezer Emmons (1799-1863), American
geologist , was born atMiddlefield, Massachusetts , on the 16th of May 1799, son of Ebenezer and Mary (Mack) Emmons.He studied medicine at Albany, and after taking his degree practised for some years in Berkshire county. His interest in
geology was kindled in early life, and in 1824 he had assisted Prof Chester Dewey (1784-1867) in preparing ageological map of Berkshire county, in which the first attempt was made to classify the rocks of theTaconic area. He still longed to pursue his interest in geology, so decided to attend the Rensselaer School (now RPI). There, he was inspired by the eminent professorAmos Eaton , and graduated from Rensselaer in its first class in 1826. While thus giving much of his time tonatural science , undertaking professional work in natural history and geology inWilliams College , he also accepted the professorship ofchemistry and afterwards ofobstetrics atAlbany Medical College .The chief work of his life was, however, in geology, and he has been designated by
Jules Marcou as the founder of Americanpalaeozoic stratigraphy , and the first discoverer of the primordial fauna in any country. In 1836 he became attached to theGeological Survey of the State of New York, and after lengthened study he grouped the local strata (1842) into the Taconic and overlyingNew York systems. The latter system was subdivided into several groups that were by no means well defined. Emmons had previously described the Potsdamsandstone (1838), and this was placed at the base of the New York system. It is now regarded as UpperCambrian .In 1844 Emmons for the first time obtained
fossil s in his Taconic system: a notable discovery because the species obtained were found to differ from all then-known Palaeozoic fossils, and they were regarded as representing the primordial group. Marcou was thus led to advocate that the term Taconic be generally adopted in place of Cambrian. Nevertheless, the Taconic fauna of Emmons proved to include only the lower part of Sedgwick's Cambrian.Emmons made contributions on
agriculture and geology to a series of volumes on the "Natural History of New York" (1848). He also issued a work entitled "American Geology", containing a statement of the principles of the science with full illustrations of the characteristic American fossils (1855-1857). From 1851 to 1860 he was state geologist ofNorth Carolina . He died atBrunswick, North Carolina , on the 1st of October 1863.The overthrust in New York which places Lower Cambrian rocks in contact with Middle
Ordovician rocks is named for him, known as Emmons' line, formerly Logan's line. It is a segment that extends fromCanada throughVermont , New York, and farther south. It traverses through the city ofTroy, New York and the Poestenkill Falls and Gorge. He named theAdirondack Mountains (1838) andTaconic Mountains (1844) and acquainted the public with these regions. [http://ees2.geo.rpi.edu/History/emmons.html "Ebenezer Emmons (1799-1863)", Rensselaer Polytechnic Institute]ee also
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Taconic orogeny References
* [http://gsa.confex.com/gsa/2005NE/finalprogram/abstract_82193.htm Ebenezer Emmons, Father of the Taconic System (Geological Society of America abstract)]
* [http://ees2.geo.rpi.edu/History/emmons.html Biography on RPI's website]External links
[http://docsouth.unc.edu/nc/emmons/bio.html William S. Powell (ed.): DICTIONARY OF NORTH CAROLINA BIOGRAPHY]
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