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The sea, entering into the clefts of the rocks, and in a cavern at the foot of the Castillo del Morro, compresses the air and makes it issue with a tremendous noise. The same coral rocks as those of the Castillo and La Punta are found in the lofty inland mountains, accompanied with petrifications of bivalve shells, very different from those now seen on the coasts of the Antilles.
To this subject of the petrifactions of Giezier, I may now add the information which we have received in consequence of a new voyage from this country to Iceland. When Sir Joseph Banks returned from his expedition to Iceland, he landed at this place; and, having brought specimens of the petrifications of Giezer, Dr Black and I first discovered that these were of a siliceous substance.
"Un phénomène encore plus curieux que cela est cette belle pyrite sulphureuse jaune, comme de l'or, qui est quelquefois parsemée par tout la substance de pétrifications agathisées, et qui apparemment y fut déposée après la dite métamorphose
The sea having scooped it out, it seems strange and unaccountable that the interior part, where the water must have operated with less force, should be loftier than that which is more immediately exposed to its violence. The roof of it is all covered with a kind of petrifications formed by drops, which perpetually distil from it. The first cave has been a place of much safety.
The central and western parts of the island contain two formations of compact limestone; one of clayey sandstone and another of gypsum. The former has, in its aspect and composition, some resemblance to the Jura formation. Yellowish cavernous strata, with cavities from three to four inches in diameter, alternate with strata altogether compact,* and poorer in petrifications.
The sea having scooped it out, it seems strange and unaccountable that the interior part, where the water must have operated with less force, should be loftier than that which is more immediately exposed to its violence. The roof of it is all covered with a kind of petrifications formed by drops, which perpetually distil from it. The first cave has been a place of much safety.
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