The reason is the occurrence of fossil insects in amber and clay slate sediments.
2.
Pyrite or " fools gold " could be seen embedded in clay slate, particularly at Kettle Point.
3.
Next is a narrow range of Upper Helderberg limestone, followed by a vein of clay slate, the residue of the territory being calciferous mica schist.
4.
The pagoda creates a unique mood through the use of clay slate, the main ingredient of ink-stones, and maintains a gentle and delicate ratio as it ascends.
5.
It is made of clay slate, sandstone and limestone, and its roof is covered with copper that was donated by a sister of Per Brahe the Younger, Christina Brahe.
6.
This hexagonal multi-stored high stupa, Yukgak Tachung Soktap, differs from typical square shaped granite pagodas in that it is a hexagonal stone pagoda made of black-and-white clay slate.
7.
"' CIIC 500 "'is a stone inscription discovered on the Isle of Man in 1909 . The stone's material is'clay slate'and is believed to have originated from hills six miles to the south of the site where it was found.
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