| Description | Includes specimens from Bolivia sent by Proyecto Mineralogico del Precambrico; Lingula from a Lower Estuarine marine bed at Colsterworth, near Grantham; material from the Shan Plateau, Burma; fossiliferous samples from Mobil bore, central North Sea; samples from Spain, Algeria, Morocco and Portugal sent by Bataafse Internationale Petroleum Maatschappij NV; locality lists including Williams and Lockley master key to consecutive renumbering of Ffairfach Group samples (type section). |