Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 3 - By Alexander Von Humboldt And Aime Bonpland.

 -  The limestone of the
Penas is compact, bluish grey and almost destitute of petrifactions.
It appeared to me to be - Page 590
Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 3 - By Alexander Von Humboldt And Aime Bonpland. - Page 590 of 635 - First - Home

Enter page number    Previous Next

Number of Words to Display Per Page: 250 500 1000

Save Money On Flights

The Limestone Of The Penas Is Compact, Bluish Grey And Almost Destitute Of Petrifactions. It Appeared To Me To Be Much More Ancient Than The Tertiary Conglomerate Of Barigon, And I Saw It Covering, In Concordant Position, A Slaty Clay, Somewhat Analogous To Muriatiferous Clay.

I was greatly interested in comparing this latter formation with the strata of carburetted marl contained in the Alpine limestone of Cumanacoa.

According to the opinions now most generally received, the rock of the Penas Negras may be considered as representing muschelkalk (limestone of Gottingen); and the saliferous and bituminous clay of Araya, as representing variegated sandstone; but these problems can only be solved when the mines of those countries are worked. Those geologists who are of opinion that the gem-salt of Italy penetrates into a stratum above the Jura limestone, and even the chalk, may be led to mistake the limestone of the Penas Negras for one of the strata of compact limestone without grains of quartz and petrifactions, which are frequently found amidst the tertiary conglomerate of Barigon and of the Castillo de Cumana; the saliferous clay of Araya would appear to them analogous to the plastic clay of Paris,* (* Tertiary sandstone with lignites, or molassus of Argovia.) or to the clayey shelves (dief et tourtia) of secondary sandstone with lignites, containing salt-springs, in Belgium and Westphalia. However difficult it may be to distinguish separately the strata of marl and clay belonging to variegated sandstone, muschelkalk, quadersandstein, Jura limestone, secondary sandstone with lignites (green and iron sand) and the tertiary strata lying above chalk, I believe that the bitumen which everywhere accompanies gem-salt, and most frequently salt-springs, characterizes the muriatiferous clay of the peninsula of Araya and the island of Marguerita, as linked with formations lying below the tertiary strata.

Enter page number   Previous Next
Page 590 of 635
Words from 162256 to 162556 of 174507

Previous 590 591 592 593 594 595 596 597 598 599 Next

More links: First 10 20 30 40 50 60 70 80 90 100
 110 120 130 140 150 160 170 180 190 200
 210 220 230 240 250 260 270 280 290 300
 310 320 330 340 350 360 370 380 390 400
 410 420 430 440 450 460 470 480 490 500
 510 520 530 540 550 560 570 580 590 600
 610 620 630 Last

Display Words Per Page: 250 500 1000

Africa (29)
Asia (27)
Europe (59)
North America (58)
Oceania (24)
South America (8)

List of Travel Books RSS Feeds

Africa Travel Books RSS Feed

Asia Travel Books RSS Feed

Europe Travel Books RSS Feed

North America Travel Books RSS Feed

Oceania Travel Books RSS Feed

South America Travel Books RSS Feed

Copyright © 2005 - 2012 Travel Guides