{ {Newer. Red Sandstones, # { Rauchwacke, etc. # Beginning = - {Permian {Middle. Zechstein, or # of Age = - { Magnesian Limestone. # of Reptiles. = - { {Older. Conglomerates, etc., # = - { Rotheliegendes. # = - { # = - { {N. Coal Formation. # = - {Carboniferous {M. Carboniferous Limestone. # Age of = - { {O. Lower Coal Measures and # Batrachians. = { Conglomerates. # = { # = { {N. Upper Old Red, Chemung. # = {Devonian {M. Eifel and Corniferous # = { { Limestones. # Age of Fishes. = { or Erian {O. Lower Old Red, Oriskany # = { { Sandstone. # = + { # + { {N. Ludlow, Lower Helderberg. # + {Upper Silurian {M. Wenlock and Niagara # + { { Limestones. # Age of + { {O. Mayhill, etc., Oneida # Mollusks. + { { Conglomerates. # + { # + { {N. Caradoc, Hudson R. # + {Lower Silurian {M. Bala and Trenton # + { or { Limestones. # * + {Siluro-Cambrian {O. Llandielo, etc., Chazy. # * + { # * + { {N. Lingula Flags, etc., * + { { Potsdam Sandstone. * + { { {Acadian, etc.? Age of * + {Cambrian {M. (Uncertain){ Crustaceans. * + { { {Menevian? * + { {O. Longmynd, Huronian? + + EOZOIC + + { {N. Anorthosite Gneiss, etc. + {Laurentian {M. Eozoon Limestones, etc. Age of + { {O. Lower Gneiss.