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 247 of 635 - First - Home
The Soundings Prove That They Are Rocks Rising Abruptly From
A Bottom Of Between Twenty And Thirty Fathoms.
Some are at the water's
edge, others one-fourth or one-fifth of a toise above the surface of
the sea.
Angular fragments of madrepores, and cellularia from two to
three cubic inches, are found cemented by grains of quartzose sand.
The inequalities of the rocks are covered by mould, in which, by help
of a microscope, we only distinguish the detritus of shells and
corals. This tertiary formation no doubt belongs to that of the coast
of Cumana, Carthagena, and the Great Land of Guadaloupe, noticed in my
geognostic table of South America.* (* M. Moreau de Jonnes has well
distinguished, in his Histoire physique des Antilles Francoises,
between the Roche a ravets of Martinique and Hayti, which is porous,
filled with terebratulites, and other vestiges of sea-shells, somewhat
analogous to the limestone of Guines and the calcareous pelagic
sediment called at Guadaloupe Platine, or Maconne bon Dieu. In the
cayos of the island of Cuba, or Jardinillos del Rey y del Reyna, the
whole coral rock lying above the surface of the water appeared to me
to be fragmentary, that is, composed of broken blocks. It is, however,
probable, that in the depth it reposes on masses of polypi still
living.) MM. Chamiso and Guiamard have recently thrown great light on
the formation of the coral islands in the Pacific. At the foot of the
Castillo de in Punta, near the Havannah, on shelves of cavernous
rocks,* covered with verdant sea-weeds and living polypi, we find
enormous masses of madrepores and other lithophyte corals set in the
texture of those shelves.
Enter page number
PreviousNext
Page 247 of 635
Words from 67547 to 67828
of 174507
