Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 17, 2025
That the heat did not come from below, as volcanic heat would have done, is proved by the fact that the lignite beds underneath the porcellanite are unburnt. We found asphalt under the porcellanite. We found even one bit of red porcellanite with unburnt asphalt included in it. May not this strange formation of natural brick and china-ware be of immense age humanly, not geologically, speaking?
There is no volcanic rock in the neighbourhood, nor anywhere in the island; and the porcellanite, says Mr.
Sandstone overlying coal; trap dykes; syenitic porphyry dykes; black vesicular trap, penetrating in thin veins the clay shale of the country, converting it into porcellanite, and partially crystallizing the coal. On this sandstone lie fossil palms, and coniferous trees converted into silica, as on a similar rock in Angola. IGNEOUS ROCKS. Trappean rocks, with hot fountain.
About 100 yards higher up the stream black vesicular trap is seen, penetrating in thin veins the clay shale of the country, converting it into porcellanite, and partially crystallizing the coal with which it came into contact.
It is simply clay and sand baked, and often almost vitrified into porcelain-jasper. The stratification is gone; the porcellanite has run together into irregular masses, or fallen into them by the burning away of strata beneath; and the cracks in it are often lined with bubbled slag. But whence carne the fire? We must be wary about calling in the Deus e machina of a volcano.
This, we were told, is a bit of the porcellanite formation of Trinidad, curious to geologists, which reappears at several points in Erin, Trois, and Cedros, in the extreme south-western horn of the island. How was it formed, and when? That it was formed by the action of fire, any child would agree who had ever seen a brick-kiln.
Word Of The Day
Others Looking