The rocks in this quarry are siltstones and
pebbly sandstones of late Ordovician and early Silurian age,
approximately 440 to 445 million years old. The rocks provide an
insight into the environmental conditions at the boundary between
the Ordovician and Silurian Periods. The oldest rocks in the quarry
comprise late Ordovician siltstones. These contain fossilised
remains of brachiopods, a marine sea-shell. After a break in
deposition these siltstones are overlain by pebbly, rippled
sandstones which range from very late Ordovician to Silurian in
Managing this site
The site is owned by the Forestry Commission and a private
owner. The special features of this SSSI and CCW’s views about site
management have been summarised in a Site Management Statement,
addressed to the owners and managers of the land. The statement can
be found in the resource section below.
The site is designated CROW open access land. For detailed maps
and information regarding access visit our access map via the
resource section below.
Garth means ‘mountain-ridge, promontory, hill’ (garth).