| Slate
has been formed by a process which is almost as old as the earth itself. It
began when surface rocks were worn away by wind and water and deposited on the
floor of the ocean.
The deposits, through the Ordovician period, some 500 million
years ago, became buried beneath the earth and were subjected to intense pressure
and heat, forming them into sedimentary rocks.
Later movements in the earth's crust exerted immense forces
upon these rocks, forcing them up into colossal strata's on the mountain sides
as the waters receded.
The Chinese Slate industry is one of the most exciting
developments to hit the European roofing slate industry, with some of
the highest quality slate beds ever to be discovered. |