At that time, hexagonal pillars similar to those of the Giant's Causeway in Northern Ireland could be seen on one of the quarry faces.
[2] The Rowley dolerite is an intrusion of late Carboniferous age in the form of a lopolith.
[1] The main use of the Rowley Rag stone was in the production of road surfaces and kerbstones.
A public house in the village of Whiteheath was named after this rock, highlighting the importance of this naturally occurring product in this area of the Black Country.
William Withering, a member of the Lunar Society, studied the chemical composition of Rowley Rag, and gave a paper including this study to the Royal Society in the 18th century.