18G8.] 



STODDART LOWER LIAS OF BRISTOL. 



203 



formation, the latter is absent from the Gotham quarry, because, so 

 far as I know, the Keuper marls immediately underlie the Gotham 

 marble. 



The Glamorganshire beds, it is true, differ in their conglomeratic 

 condition ; but that is evidently omng to their geographical position. 



Mr. Etheridge and Mr. Sanders have both examined the spot. 

 Their intimate knowledge of the geology of the Bristol district must 

 go very far towards establishing the opinion that the Sutton series 

 belongs to the Planorbis-zone. 



rig. 4. — Cotham Quarry. 



No. 9. 



No. 10. 



No. 11. 



No. 12. 



No. 13. 



No. 14. 



No. 15. 



ft. in. 



2 6 Rubble Am.planorbh,LiiitaDun- 



ravenensis. 

 4 Purplish clay. 



6 Limestone A. tortilis. 



rll Blue limestone 1 

 J beds alternating I 

 J with clays. Sutton f 

 L series. J 



/ Lima Dunrave)iensi,-\ 

 I Lima tuberculata 



Pecteii Suttonensis. 



Pinna insignis. 

 J Ostrea muUicosfa'a. 

 \ Gardenia Suttonensi^. 



9 Blue conchoidal lime- 

 stone. 



Fish-scales and elytra. 



Limestones and shales A, Johnstom. 

 with clay partings. 



2 Thin beds of White Lias. Modiola minima, JSJya- 

 cites, MonoiiK, &(\ 



4 Cotham landscape-itone. 



9. Bubble Bed. — This, which underlies the soil, contains a con- 

 siderable number of very good specimens of Ammonites planorbis. 

 In the same bed are Lima gigantea and Lima Dunravenensis. The 

 last agrees exactly with Mr. Tawney's fossil by differing from L. 

 gigantea in having well-marked ribs, and from L. punctata, which 

 it greatly resembles, by having slight rug£e instead of the well-known 

 punctate markings. 



Under an intervening 4-inch seam of clay is 



10. Tortilis-hed. — This is only interesting as denoting its geo- 

 logical position by containing Ammonites tortilis, D'Orb. 



11. Sutton Beds. — As described in the section, these are eleven 

 beds of limestone, alternating with clays. The sixth from the top 



