1911 Encyclopædia Britannica (1911)
“ The shales of the Millstone Grit include thin beds of marine goniatites (Glyphioceras bilingue, Gastrioceras carbonarium) , Pterinopecten papyraceus, and Lingula mytiloides, while the grits contain Lepidodendron, Stigmaria and calamites. In Scotland plants and estuarine fishes differ markedly above and below the Roslin Sandstone. The English Millstone Grit produces a characteristic scenery of wild moorland plateaux, or alternations of shale-valleys and rugged grit-ridges. The grits furnish valuable building-stones, and grindstones. They also afford an excellent water supply. ”
