Looking for greywacke at Linn's Tomb

 The tomb of the Covenanter Alex Linn is a beautiful place. The space was filled by fragrant primroses.

There was an exposure of ground rock nearby. The BGS viewer says that the bedrock is Kirkcolm Formation Wacke. Chasing it back, it is part of the Caradoc Series, which is a set of Ordovician sandstones laid down on the floor of the ocean. The rocks are grey and quite gritty. It seems the series was named after a hill in Shropshire. Now to find the Coniston limestones which are an upper part of this Caradoc Series ...