At certain localities the Ar- chaeo-sthatic shale The failure to distinguish be- tween the Archean limestone, usually very coarse grained, but showing variations in grain— and the Cambrian limestone, ofen brecciated at the fault line and then moderately metamorphosed - has been another stumbling block. Our failure to recognize the Ar- chaean gneisses as something distinct from Archean true granites, and calling everything granite has been another mis- take. This mistake was not so much petrographic, as structural since the “granite” was falsely supposed to have metamorphosed the Archean limestone under the supposition that this lime- stone was Cambrian. This made the granite to post Cambrian. This is wrong. It is pre Cambrian.