21 November 2003
The "Wildlife Matters Issue 31, Spring 2003" states that during a visit to Knowl Hill in Summer 2002, plant ecologist, Nick Stewart, who was studying stonewort species in quarries and gravel pits, discovered in pools there, three species: common stonewort, delicate stonewort, and dark stonewort. Stonewort is so named because when it is removed from the water and dried it becomes hard like stone. It used to be used for scrubbing and scouring.
Author: North East Wales Wildlife
Year = 2003
Month = November
Day = 21
Landscape = Industrial
Extra = 2000s
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