Mineral Industries and Geology of Certain Areas - Vermont Agency ...

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REPORT OF THE VERMONT STATE GEOLOGIST. 97 Dr. George M. Dawson, in his Annual Report of the Geological Survey of Canada, Vol. VII, 1894, Appendix 133 J., enumerates the following species from the collections made by Dr. R. W. Ells and \V. E. Deeks, I890 and by H. M. Arni and H. B. Cushing, 1894: Leptograptus, species indeterminate. Dicellograptus, probably new species. Dicranograptus ramosus, Hall. Climacograptus bicornis, Hall. Clirnacograptus bicornis, variety scalaris. Climacograptus, new species. Diplograptus foliaceus, Murchison. Diplograptus angustifolius, Lapworth. Glassograptus ciliatus, Emmons. Corynoides calicularis. The comparative absence of fossiliferous terranes in eastern Vermont has made doubtful from the biological standpoint the stratigraphical position of the slates, Bradford schist and Washington limestone. It has been left to physical, stratigraphical and lithological similarity; therefore its pronounced age has oscillated from the Primitive of Zadoc Thompson to the Niagara of Dr. Dana. If we attempt to define the general stratigraphical succession in accordance with some great cycle of orogenic development in eastern Vermont, we find the slate resting unconformably upon the great 1-luronian terranes on the east and the west. The eastern slate is the oldest and marks the beginning of the Lower Trenton series; the western is the youngest and marks the culmination of the period. The succession is continuous from east to west, and records no unconformity in Orange county. If ever such relations are found between the Lower and Upper Silurian terranes of eastern Vermont, I am confident that it will be in the vicinity of Lake Memphremagog. Although the uncei-taintv increases as we approach the more and more ancient deposits, nevertheless it is not extremely diffi-
ON 98 REPORT OF THE VERMONT STATE GEOLOGIST. cult to give a true stratigraphical position to these Palaeozoic terranes. When we study the records of the Canadian graptolites, when, we consider the lithological homogeneity of these slates, when we accept the evidence of crinoidal stems in the \Vashington limestone, when we know the true stratigraphical position of these terranes, we are compelled to locate the clay slates, the Bradford schist and the \Vasbington limestone as Lower Silunan, and more specifically Lower Trenton. BIBLIOGRAPHY. 1841 Final Report on the Geology of Massachusetts: Mica Schist with Beds of Limestone—Dr. Edward Hitchcock. 1842 History of Vermont, Natural, Civil, Statistical, with Ap-- pendix upOn the Geology of Vermont, pp. 222, 223. Limestone with Argillaceous Slate.—Zadoc Thompson. 1845 First Annual Report of the Geology of Vermont. p. 6. * Calcareo-mica Slate Belonging to the Primary System—Professor C. B. Adams. 1846 A Manuscript Map; Calcareo-mica Slate—Professor C. B. Adams. American Journal of Science. 11 Edition, Vol. I, p. 435. Calcareo-mica Slate.—Professor C. B. Adams. 1847 Third Annual Report of the Geology of Vermont, p. 24. Calcareo-mica Slate—Professor C. B .Adams. Geological Survey of Canada. A Geological and Miiieralogical Description of the Eastern Townships. Gaspé Slate—Sir W. E. Logan. 1848 GeOgTaphy and Geology of \ermont, 44 , 45 , 188, 189. Calcareo-mica Slate.—Zadoc Thompson. 1855 Esquisse GeolOgiqUe of Canada, accompanied by a geological map of British North America to illustrate the extensive collection of rocks and minerals at the Paris Exposition. Niagara Limestone.—T. S. Hunt. 1856 Preliminary Report of the Natural History of Vermont. Appendix, p. 76. Calcareo-mica Slate—Augustus Young. REPORT OF THE VERMONT STATE GEOLOGIST. 99 1858 Proceedings of the Boston Society of Natural History. Calcareo-mica Slate.—C. H. Hitchcock. Second Annual Report of the Geological Survey of Vermont, p. 10. Calciferous Mica Schist.—Dr. Edward Hitchcock. 1859 Geological Map of A. D. Hagar, published in connection with H. F. Walling's topographical map of Vermont. Mica-slate Schist. 1861 Geology of Vermont. Calciferous Mica Schist.—Dr. E. and C. H. Hitchcock. Map of Final Report. Calciferous Mica Schist.—C. H. Hitchcock. 1862 Letter to Mr. Joachim Barronde on the Taconic Rocks of Vermont and. Canada. Lower Taconic (Cambrian).—Jules Marcou. Proceedings of the Boston Society of Natural History, Vol. VII. pp. 327, 369; Vol. VIII, P. 239. Calciferous Mica Schist.—C. H. Hitchcock. 1863 Geological Survey of Canada, with Atlas, pp. 431, 432. Gaspé Slates and Limestones Upper Silurian).—Sir W. E. Logan. i86 Monograph of the Graptolitidae of the Quebec Group. Decade II, Niagar.—Dr. James Hall. i866 Geological Map of Canada. Gaspé Slates and Limestones—Sir W. E. Logan. 1867 Geology of Vermont. Papers before the A. A. A. S. Calciferous Mica Schist.—C. H. Hitchcock. Manual of Geology. Third Edition, P. 221. Niagara.- Dr. James D. Dana. 1869 First Annual Report on the Geology and Mineralogy of New Hampshire, P. 21. Calciferous Mica Schist.- Dr. C. H. Hitchcock. 1870 Second Annual Report on the Geology and Mineralogy of New Hampshire, p. 17. Calciferous Mica Schist.- Dr. C. H. Hitchcock. The Geology of Northern New England. Paragraph 12 under Geology of Vermont. Calciferous Mica Schist. —Dr. C. H. Hitchcock.
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