Torridonian sandstone thin section slide exhibiting a fine grained arenaceous nature. The Torridonian Sandstones date from the Pre-Cambrian & are amongst the oldest rocks to be found in the UK. The sandstones are a part of the Torridonian Supergroup which include arkoses, shales & conglomerates where they overlie the older Lewisian rocks. These sandstones are typically hard, coarse to fine grained and often show trough or planar cross bedding. Our thin section are typically fine grained, subarkosic i.e. contain 5 - 15 percent feldspar and grains are sub angular - sub rounded. The section is made to 30 microns thickness and the glass is 46 x 27 mm in size with a cover slip. Supplied in a protective card sleeve with a label, ideal for microscopy.