The undisputed Rhætic rocks lie between the White Lias and the Triassic Marls. In Warwickshire they are rarely exposed, and then much reduced in bulk, compared with their development in Gloucester and Glamorgan. They may be seen to a limited extent below the White Lias in the railway cutting at Harbury, where a band of yellowish sandstone contains the small bivalved crustacean, _Estheria minuta_; and also at the small outlier of Brown’s Wood, and at Stooper’s Wood, near Wooton Wawen, where this sandstone occurs with inferior shelly limestones and sandy bands, containing the usual Rhætic fossils, _e.g._, _Cardium Rhæticum_, _Avicula contorta_, _Pleurophorus elongatus_, _Pecten valoniensis_, and _Schizodus cloacinus_. The nearest exposure of the Rhætic to Birmingham occurs round the fringe of an outlier of Lower Lias resting on the Upper Red Marl near the village of Knowle. This outlier is about a mile and a half long, by half a mile broad. Its highest beds at Copt Heath contain _Ammonites planorbis_. The beds referred to the Rhætic include a stratum of yellow micaceous sandstone full of _Schizodus cloacinus_, which, though usually in the form of casts, is sharp and well defined. The bone bed, though no where exposed, is probably present in its normal position. A fine section, with numerous characteristic Rhætic fossils was exposed on the railway cutting at Summer Hill, between Stratford and Alcester. Rhætic black shales were passed through at Snitterfield, in making a tunnel in connection with the new reservoir for Stratford. Glacial and Post Tertiary Deposits. BY H. W. CROSSKEY, LL.D., F.G.S. Post Tertiary Deposits are scattered profusely over the district of which Birmingham is the centre, and present many problems of too complicated a character to be discussed in the pages of this guide. It must suffice to indicate a few of their chief exposures and characteristics. The term “_Boulder Clay_” is used in this note to denote a clay shown to be connected with the Glacial epoch, by containing a greater or less number of erratic blocks; and in the employment of the term, no theory regarding the method of formation of the deposit will be implied. The Post Tertiary deposits of the district may be arranged in the following general order:-- I.--Lower boulder clays. II.--Middle glacial clays, sands, and gravels. III.--Upper boulder clays. IV.--Post glacial clay, sands, and gravels. The most complete section that has been found is at “California,” near Harborne.