1910 Drilling Core sample Llay Main Colliery
Description
This is a piece from the borehole on the Straight Mile in 1910. The rock is thought to be mudstone belonging to the Carboniferous period [359 - 299 million years ago].
This drilling proved that the coal measures continued in a dip to the east. It was important in establishing Llay Main Colliery on its site on Rackery Lane.
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