68 



LOWER LIAS. 



Lyme Begis. — The zone of Ammonites BucMandi is admirably exposed in the coast- 

 section at Lyme Regis, Dorset, both in the Church CUffs and at Pinhay Bay, where the 

 beds consist of a series of gray limestones, from 2 to 10 inches in thickness, varying from 

 earthy to compact, and alternating with marls and shaly beds — either seams of a few 

 inches, or beds of many feet in thickness. The following section, from the lowest stratum 

 on the shore to Broad Ledge, which may be considered as the uppermost bed of the Am. 

 BucMandi or Lima series, affords a correct view of the stratigraphical order of these strata 

 and of the fossils they contain. 



Section of the Ammonites Bucklandi or Lima beds from Broad Ledge to the shore at 



Lyme Bey is. 







m 





LiTHOLOGY. 



No. ft. in. 

 '' 1. Dark-gray limestone. "Broad 



Ledge " or " Table-bed " 3 6 



2. Dark marls and sbales, with bands 



of clays 15 



3. Gray limestone 4 



4. Dark slaty marls 4 



{ 5. Dark-gray limestone 1 



G. BJack shales, with partings of 



gypsum 2 6 



7 . Dark-grayish limestone 10 



8. Dark-shale 2 



9. Hard gray limestone. " Gray 



Ledge" 1 3 



10. Dark shaly marls 2 



11. Gray limestone 6 



12. Dark indurated shale 3 6 



13. Bluish limestone 1 



14. Dark shales, containing indurated 



imperfect limestone 1 G 



15. Bluish limestone 10 



16. Dark indurated clay 1 3 



17. Gray limestone, with the plant- 



bed at the top 6 



18. Dark-bluish limestone 1 6 



19. Dark shale 8 



Organic Remains. 

 RhyncJionella variabilis, Scbloth, in masses. 



Ichthyosaurus communis, Conyb., T. platyodon, 

 Conyb., Ammonites semicostatus, Y. & B., and 

 Rhynchonella variabilis, Schl. 



Ammonites Turneri, Sow., and Am. semicostatus,Y .&B. 



Lima gigantea. Sow., L. antiquata. Sow., and Rhyn- 

 chonella variabilis, Schloth. 



Ichthyosaurus communis, Conyb. (in the " fire-stone 

 beds" west of the Cobb). 



Lima gigantea, Sow., L. antiquata. Sow., and Rhyn- 

 chonella variabilis, Schloth. 



Gryphcea incurva, Sow. 



Fin-spines of Hybodus, Rhynchonella variabilis, 

 Schloth, and Pentacrinus tuberculatus. Mill. 



Ichthyosaurus platyodon, Conyb. 



Spines of Pseudo-diadema, and other Echinidcs. 



Ichthyosaurus platyodon, Conyb. 



Grypheea incurva, Sow., Rhynchonella variabilis, 

 Schloth, and Lima antiquata, Sow. 



Ichthyosaurus communis, Conyb., I. platyodon, 

 Conyb., Pentacrinus tuberculatus, Mill., and 

 Lima gigantea. Sow. 



Grypheea incurva, Sow., and fragments of Penta- 

 crinus tuberculatus, Mill. 



Otopteris obtusa, L. & H., and Araucarites pere- 

 grinus, Sternb., in the plant-bed. 



Ammonites Conybeari, Sow., and Rhynchonella 

 variabilis, Schloth. 



Grypheea incurva, Sow. 



