We meet also with claystone, greenstone, compact feldspar, and tuff.
"The Student's Elements of Geology"
Sir Charles Lyell
Although fossiliferous, the stone resembles a sandy claystone of the trap family.
"The Student's Elements of Geology"
Sir Charles Lyell
It also passes in the same uninterrupted manner into a basalt, and at length into a soft claystone, with a schistose tendency on exposure, in no respect differing from those of the trap islands of the western coast."
"The Student's Elements of Geology"
Sir Charles Lyell