Thus, we may observe in one and the same section numberless alternating beds of sandstone and shale from an inch or so up to several feet each in thickness, with seams of coal, fireclay, ironstone, and limestone interstratified among them.
"Geology"
James Geikie
He did this by remelting refined high quality wrought iron bars at very high temperatures in sealed fireclay crucibles, together with small quantities of charcoal and ground glass as reagents.
"Our Legal Heritage, 4th Ed."
S. A. Reilly
To prospect the fireclay bed.
"For the Allinson Honor"
Harold Bindloss