exposed
in the central part of the Lake District and provide some of the
most dramatic scenery of the area. They are collectively known as the
Borrowdale Volcanic Group.Ordovician(510-439 Ma.) and Silurian (439-408 Ma.) ( Lower Palaeozoic) times. Part 2 of 3
Subsequently,
during Middle and Upper Ordovician times, ocean crust began to be
subducted beneath the Avalonian continent. This resulted in volcanic
activity. The volcanic rocks consisting mainly of andesite lavas and
tuffs are, with the exception of the Eycott Volcanics, exposed
in the central part of the Lake District and provide some of the
most dramatic scenery of the area. They are collectively known as the
Borrowdale Volcanic Group.
During Silurian
times volcanic activity ceased and deep water graptolitic mudstones,
siltstones and greywackes, were deposited in the now closing Iapetus
Ocean. These sediments, the Windermere Group, can now be seen in the
southern part of the Lake District, e.g. around Lake Windermere. They
provide a gentler type of scenery in contrast to the Borrowdale Volcanics.
Back
to Part 1
To
Part 3
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