View over Lough Nafooey and the Finny River from the start of walk 1
Walk 1: Volcano
Knockkilbride and the Finny River area are renowned as the site of an ancient volcano (490 million years old), formed as the Iapetus ocean closed to bring the two halves of Ireland together (see Continents Adrift). The actual landform of the volcano is long gone but some of its rocks are preserved. Eruptions at the "Finny Volcano" were of two types: runny basalt magma formed pillow lavas, stacks of interlocking lava balls, when blobs of lava were chilled by eruption into water: sticky andesite magma broke up to form breccia deposits of rock fragments. Quiet periods between eruptions allowed very fine sediment to settle and form red and green chert.