It is often silicified, and when broken shows bundles of tubular channels.
Pieces of silicified wood were frequent in the bed of the Isaacs.
The silicified wood (particularly characteristic) was yet absent.
At Portrush, the Lower Lias is seen on the shore, crowded with ammonites, but silicified and metamorphosed by invading dolerite.
It is an interesting fact that the silicified wood of the Irawadi should have attracted attention more than one hundred years ago.
Fine-grained sandstone, with impressions of leaves, was again observed, and a few pieces of silicified wood.
A gold mine has been worked close to the clump of silicified trees.