The
end of
limestone depositionin the Isle of Man
was marked by the explosive eruption of a volcano which formed the
basaltic rocks now exposed between Scarlett and Poyllvaaish.
Vents and fissures along which magma flowed to surface can be seen
in the area around Scarlett Point.
Basalt
lava and ash are
erupted from a volcano
which form the Scarlett
volcanics at Castletown
Lava
erupted under water
can form pillow-shaped structures,
rather like toothpaste being
squeezed out of a tube
Dykes are fissures in which
magma solidifies
before reaching the surface
This
photograph shows volcanic
rocks at Poyllvaaish
