Bedrock

AZ - StMaughans

Bedrock
Hardened (cemented or lithified) rocks more than 2 million years old.
In our area of interest these are predominantly mudstones and sandstones of Silurian and Devonian age (roughly 400million years old)– also known as Old Red Sandstone. Shown on geological maps unless any overlying superficial deposits are more than two metres thick.