158 THE LIAS AMMONITES. 



No. 7. Calcareo-siliceous Sand. — Of a brown, grey, or yellow colour. It forms the 

 uppermost bed in the North Quarry, and constitutes the subsoil over a considerable area 

 of this part of the hill. It has been much denuded in parts ; measures in some places 

 five feet in thickness, and is unfossiliferous. I know of no other bed in our district 

 which presents lithological characters similar to those of this sandy stratum. 



No. 8. Wavy Sandstone. — This is a hard, brown, thin-bedded rock, with a wavy 

 stratification ; it is siliceous in some parts, and calcareous in others. The siliceous 

 portions are unfossiliferous ; the calcareous are represented by slabs of thin ragstones, 

 containing many fossils. On some of these I found Serpula socialis, Goldf., in great 

 abundance. This bed has a thickness of three feet, and rests on 



No. 9. Marly Oolite. — Broken up into fragmentary portions. It appears to be the 

 upper portion of the Upper Freestone. 



No. 10. Tipper Freestone. — A thick-bedded, coarse-grained oolitic limestone, used 

 for rough work. This rock was long thought to be unfossiliferous ; and considerable 

 doubts were entertained as to the precise position of these beds in the series. During 

 my last visit, however, I succeeded in obtaining from the lower and middle beds a few 

 specimens of large, old, deformed Terehratula fimbria, Sow., which enabled me to 

 determine its position as superior to the Oolite-marl, and to identify the rock as the 

 Upper Freestone. It has a thickness of twelve feet. 



c. The Zone of Harpoceras MurcJiisonce. 



No. 11. Thin flaggy Oolite. — This rock splits into thin layers. Numerous shelly 

 fragments are found in some slabs, but fossils are rare ; thickness, four feet. 



No. 12. Fimbria-bed or Oolite-marl. — This bed is well exposed on the western side 

 of the hill, and consists of a cream-coloured marl, like indurated Chalk, interstratified 

 between two beds of oolitic limestone, resting upon the uppermost bed of the Lower, 

 and overlain by the thin flaggy beds of the Upper Freestone. It forms a very persistent 

 stratum in the Northern and Middle Cotteswolds, extending across this portion of the 

 plateau, from the vales of Morton and Bourton on the east, to the mural escarpments of 

 the Inferior Oolite on the west, but thinning out and disappearing in the southern part 

 of the range. In some localities, as at Leckhampton, Sheepscombe, and Swift's Hill, 

 near Stroud, it contains masses of Corals, of the genera Tkamnastrcea and Isastrcea ; in 

 others, as near Nailsworth, it abounds with numerous shells of the genus Nerincea, 

 forming there a " Nerinsean Limestone ;'' in other^, as at Cleeve and Cubberley, the 

 marl is charged with BracJiiopoda, chiefly Terebratula fimbria. Sow., associated with a 

 few Terebratula carinata, T. suhmaxillata, and BJiync/ionella Lycetti. The fauna of the 

 Oolite-marl induced me, in a former paper thereon, to consider this bed as the product 

 of an ancient Coral-bank. " The direct evidence of the existence of Anthozoa in 



