The fossils of the Upper Greensand of Warminster have long been known to collectors and geologists on account of their number, variety, and excellent state of preservation; but little information has ever been published regarding the beds which yield them. Collections of the fossils are to be seen in most of the museums of the country, and the fauna represented by these collections has often been regarded as the typical fauna of the English Upper Greensand. This, however, is a mistake, for where fully developed, as in Wiltshire, the Upper Greensand includes two faunas which differ considerably from one another—(1) that of the malmstone and micaceous sand (Devizes Beds), (2) that of the greensands and chert beds (Warminster Beds). The complete succession of the Gault and Greensand Beds near Warminster is as follows:—