Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 3 - By Alexander Von Humboldt And Aime Bonpland.
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It Is Easy To
Distinguish Two Formations In The Euphotide; One Is Destitute Of
Amphibole, Even When It Alternates With
Amphibolic rocks (Joria in
Piedmont, Regla in the island of Cuba) rich in pure serpentine, in
metalloid diallage and sometimes
In jasper (Tuscany, Saxony); the
other, strongly charged with amphibole, often passing to diorite,* has
no jasper in layers, and sometimes contains rich veins of copper;
(Silesia, Mussinet in Piedmont, the Pyrenees, Parapara in Venezuela,
Copper Mountains of North America). (* On a serpentine that flows like
a penombre, veins of greenstone (diorite) near Lake Clunie in
Perthshire. See MacCulloch in Edinburgh Journal of Science 1824 July
pages 3 to 16. On a vein of serpentine, and the alterations it
produces on the banks of Carity, near West-Balloch in Forfarshire see
Charles Lyell l.c. volume 3 page 43.) It is the latter formation of
euphotide which, by its mixture with diorite, is itself linked with
hyperthenite, in which real beds of serpentine are sometimes developed
in Scotland and in Norway. No volcanic rocks of a more recent period
have hitherto been discovered in the island of Cuba; for instance,
neither trachytes, dolerites, nor basalts. I know not whether they are
found in the rest of the Great Antilles, of which the geologic
constitution differs essentially from that of the series of calcareous
and volcanic islands which stretch from Trinidad to the Virgin
Islands. Earthquakes, which are in general less fatal at Cuba than at
Porto Rico and Hayti, are most felt in the eastern part, between Cape
Maysi, Santiago de Cuba and La Ciudad de Puerto Principe.
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