118 



THE LIAS AMMONITES. 



5th. A thin band of blue and yellow clay, containing many Harpoceras falciferum. 

 Sow., Belemnites acuarius, Schloth., and MhyndioneUa pi/gmaa, Moore, This bed rests 

 upon the light-coloured marls of the Spinatus-stage. 



From a railway cutting near Stroud, I obtained many fine specimens of Harpoceras 

 serpentinum , Rein., and during the execution of works for drainage, and the formation of 

 a new road near Nailsworth, good sections of the Upper Lias were exposed ; from the 

 bands of limestone numerous fossils were obtained, as Sfephanoceras commune. Sow., 

 Harpoceras bifi'ons, Brug., Harp, falciferum, Sow., Phylloceras heterophyllum. Sow., 

 Lytoceras cornucopia. Young., Harp. Lythense, Young., Belemnites compressus^ Voltz., 

 Nautilus latidorsatus, d'Orbig., Turbo capitaneus, Miinst., Pleurotomaria sub-decor ata, 

 Miinst., Astarte lurida, Sow., Posidonomya Bronni, Voltz., Nucula Hausmanni, Roem., 

 Gresslya gregaria, Roem., Lima bellula, Mor. and Lye, Lima gigantea^ Sow., Tancredia 

 Iceviuscula, Lye, and several un described forms. 



The Rev. Dr. Smithe,^ F.G.S., has given an interesting account of two quarries of 

 Upper Lias, on the top of Churchdown Hill, and known as north and south, the latter 

 being the larger and better of the two for its section. The beds are nearly horizontal^ 

 and exhibit only slight traces of disturbance, 



StepJiatioceras commune Zone at Churchdown. 



No. 



Petrology. 



Alluvial soil 



Brown marly soil 



Concretionary argillaceous limestone 



Blue and drab mottled clay 



Brown marly shale 



Blue and yellow clay 



Thick- 



ness. 



ft. 



in. 



1 



6 



2 







4-6 



6 







1 







I 







Organic Remains. 



Fish, Crustacea, and all the fossils of list. 

 "Fish bed," Leptolepis concentricus, Thrissops, 



sp., Stephanoceras commune, Posidonomya 



Bronni, Mytilus gryphoides. 

 " Alga bed," fossils of No. 2, with Algce, Aptychi, 



&c. 

 " Leptsena bed," Spiriferina, Leptcena, Terebra- 



tula, and Rhynchonella, with Nucula and 



other Lamellibranchs. 

 Stephan. commune, Bel. acuarius, Rhyn. pygmcea, 



Terebrat. globulina. 



Light-coloured " nodular bed," Splnatus-zone, containing Belemnites. 



We have in the above a replica of the Upper-Lias section so well shown at Ilminster, 

 Somerset, and of that at Curcy, la Caine, Calvados, described by Professor Deslong- 

 champs.^ 



1 "The Geology of Churchdown Hill," ' Cotteswold Club,' August, 1861. 



2 'Etudes sur les Etages Jurassiques Infer, de Normandie,' p. 75, 1864 



