The Devonian dolomites, limestones and red sandstones cover immense tracts and appear on the surface over a much wider area.
It is traversed from west to east by the main chain of the Alps, which rises in various snow-covered summits, the more important being the Ortler (12,802 ft., the loftiest peak in Tirol and in the Eastern Alps generally), the Wildspitze (12,382 ft., Oetzthal group), the Zuckerhiitl (11,520 ft., Stubai group), the Hochfeiler (11, 559 ft., Zillerthal group), the Gross Venediger (12,008 ft.) and the Gross Glockner (12,461 ft., both in the Tauern range), while more to the south are the Dolomites, which culminate in the Marmolata (10,972 ft.).
The value of the product of limestones and dolomites in 1900 was $124,728; in 1902, $228,662; of sandstones and quartzites in 1900, $37,038; in 1902, $165,565; while the value of all stone produced in 1907 was $497,962, and in 1908, $ 6 59,574.
The total value of all mineral products in 1902 was $6,769,104, of which $6,464,258 were represented by gold and silver, $110,789 by sandstones and quartzites and $86,605 by limestones and dolomites; in 1908 the total value was $8,528,234, which was an i increase of more than $3,500,000 over the value in 1907.
Rhaetic beds (Infra Lias), consisting of dolomites and siliceous limestones, have been recognized at Saida.
They are found on the borders of Guatemala and consist of limestones and dolomites with Productus.
Limestones and dolomites suitable for building purposes are obtained chiefly in Montgomery, Chester and Lancaster counties, and even these are generally rejected for ornamental work on account of their colour, which is usually bluish, grey or mottled.
Yet, as a matter of fact, several important mountain groups are situated on one or other side of the watershed of the Alps, and form almost independent ranges, being only connected with the main chain by a kind of peninsula: such are the Dauphine Alps, the Eastern and Western Graians, the entire Bernese Oberland, the Todi, Albula and Silvretta groups, the Ortler and Adamello ranges, and the Dolomites of south Tirol, not to speak of the lower Alps of the Vorarlberg, Bavaria and Salzburg.
The Dolomites of South Tirol (from the Brenner Pass Monte Croce Pass, and south of the Pusterthal).
Chief Peaks of the Dolomites of South Tirol.
Chief Passes of the Dolomites of South Tirol.
Edwards, Untrodden Peaks and Unfrequented Valleys (1873, Dolomites); Max FOrderreuther, Die Allgauer Alpen (1906); D.
Sinigaglia, Climbing Reminiscences of the Dolomites (1896); K.
Tuckett, How we Spent the Summer (1864), Pictures in Tyrol (1867), and Zigzagging amongst Dolomites (1871); J.
The folding, moreover, is less intense; but in the Dolomites of Tirol there are great outbursts of igneous rock, and faulting has occurred on an extensive scale.
In descending order they embrace the following subdivisions, whose thickness in the district of Durness is estimated at about 2000 ft.: (e) limestones, dolomites and cherts, with numerous organic remains; (d) grit and quartzite, with Saltarella and Olenellus (Serpulite Grit); (c) calcareous shales and dolomites, with many annelid casts and sometimes Olenellus (Fucoid Beds); (b) Upper Quartzite, often crowded with annelid pipes (Pipe Rock Quartzite); (a) Lower Quartzite - their original upper limit can nowhere be seen, for they have been overridden by the Eastern Schists in those gigantic underground disturbances already referred to, by which these rocks, the Archean gneiss and Torridonian sandstone, were crumpled, inverted, dislocated and thrust over each other.
With these are often associated limestones, dolomites and marbles containing serpentine (Kolmarden).
Besides limestones and dolomites, the only building stone of much commercial importance is the Potsdam sandstone, extensive beds of which lie in the north part of the upper peninsula.