|place:-||stone wall, Borrowdale|
Borrowdale parish, once in
|stone wall; geological site|
stone wall, Borrowdale -- Borrowdale -- Cumbria / -- 24.8.2008
stone wall, Borrowdale -- Borrowdale -- Cumbria / -- The curbstones are also the same stone. -- 24.8.2008
In this area the rock is a brecchia, a mud flow of volcanic
ashes, a tuff, with angular fragments of broken Skiddaw
group mudstones; this is perhaps a lahar? This is at the
edge, the lowest/earliest layers, of the Borrowdale Volcanic
Group. The Borrowdale volcanics started with a bang, as an
eruption broke through the overlying mudstones at the end of
the Ordovician period. The volcanism caused by the
subduction zone on the margin of the Iapetus Ocean which was
closing. The rocks are iron stained, red.
NB: beware my amateur geological knowledge.
|Old Cumbria Gazetteer - JandMN: 2013|