The "'River Road Stone Arch Railroad Bridge "'is a historic bridge carrying the former Air Line Railroad right-of-way over River Road in Salmon River State Forest in Colchester, Connecticut.
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The quarries are major suppliers of road stone to southern England, between them producing around twelve million tonnes a year, employing over two thousand people with an annual turnover of ?50m.
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Various pits that are visible in the high woods of Toys Hill include pits dug by charcoal burners and chert pits, for quarrying chert, a hard sandstone found in the Lower Greensand formation that has been extracted for many centuries for local road stone and building stone.
