Thursday 15 January 2015


Igneous rocks that are foreign to the chalk geology of Salisbury Plain. 

Bluestone is not a geological term but a convenient label for all the smaller stones at Stonehenge, which are not sarsen stones. They are a variety of types, including dolerites, spotted dolerites, rhyolites and volcanic tuffs, all of which come from the Preseli Hills in south-west Wales.