The geology of New Hampshire. A report comprising the results of explorations ordered by the legislature (1874) (14753529596)

Identifier: cu31924003939885 (find matches)

Title: The geology of New Hampshire. A report comprising the results of explorations ordered by the legislature

Year: 1874 (1870s)

Authors: New Hampshire. State geologist (1868-1878) Hitchcock, Charles H. (Charles Henry), 1836-1919

Subjects: Geology Rivers Insects Botany Fragilariaceae Drift Mineralogy Physical geography

Publisher: Concord, E.A. Jenks, state printer

Contributing Library: Cornell University Library

Digitizing Sponsor: MSN

Text Appearing Before Image:

It is not entire, as when formed, since thetooth of time has gnawed into it, or eaten through in a few instances.Very soon the uneasy earth vomited out another igneous flood, coveringthe same area, and nearly as great a quantity. Modern volcanoes areapt to throw out lava of slightly different mineral character at succes-sive epochs of eruption. So it was with these ancient New Hampshirevents. The second overflow is a granite, spotted with rounded crystalsof feldspar, and scarcely any quartz is present. The first carried a con-siderable quartz. The second verges into a compact feldspathic mass.I call it the Albany graiiite. If you desire to see localities, visit Welchmountain, Mts. Flume and Liberty in Franconia, the summit of Profile,the Twin mountains, and certain peaks in Bartlett and Jackson, besidesmany elevations in Albany. This material thins out in the east. Be-neath Pequawket it is not over one hundred feet thick, while it is eight The Labrador PeriodJ/^rrSTM^lnT,:;:^ l! ^ 1 1

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PHYSICAL HISTORY OF NEW HAMPSHIRE. 529 hundred or one thousand feet elsewhere, as in the Twins, and Mts. Flumeand Liberty. It crops out also near the summit of Lafayette. A thirdoutburst was more limited, but it gave rise to the sharp peak of Cho-corua and to small hills west of Mt. Hancock, which I term the Chocoruagranite. It is likely that corresponding eruptions gave rise to similargranites in the Starr King group of mountains, Stratford and Columbia,the granitic country of Essex county, the gores of wild land east ofMontpelier, Little Ascutney, and about Cuttingsville, Vt., besides theOssipee mountains east of Winnipiseogee. Possibly the latter may haveaccumulated by a branch stream running southerly from the Saco riveroutburst This granite, when finally cooled off, seems to have beencovered by water, since there succeeds a great thickness of fine sedi-mentary deposits. This proves to be of four kinds,—coarse and finelabradorites and variously colored potash feldspars above the

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