SILURIAN

name proposed by chis on in 1835 for the pate 8 sedimentary strata) of the Paleozoic or Primary period. These strata consist of grits, and conglomerates, and lie on the/| Cam brian Rocks, and under the Old|at Red Sandstones and Devonians. They are divided into Upper 8 rian ee ada ri Upper Llandovery Group. Lower Llandovery Group. Lower 8. {Llandeilo Group.’ Lingula Beds. Deposits are c. 20,000 ft. in thickne , and are found in Wales, West more land, Cumber land, Scot. Highlands, Ireland, Kurope, and other places.