68 



LOWER LIAS. 



Lyme Beyis. — The zone of Ammonites Bucldandi is admirably exposed in the coast- 

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

 beds consist of a series of gray limestones, from 3 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. 

 Bucldandi 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 Ledrje to the shore at 



Lyme Beyis. 



pq 



3 



s 



0^ 







LiTHOLOGY. 







Organic Eemains. 





No. 





ft. 



ill- 







' 1. 



Dark-gray limestone. " Broad 







Rhpichonella variabilis, Sclilotli, in masses. 







Ledge" or "Table-bed" 



3 



6 





<u 



pq 



2. 



Dark marls and shales, with bands 







Ichthyosaurus communis, Conyb., /. platyodon, 









15 



0 



Conyb., Ammoniies semicosiatus, Y. & B., and 



ss 











Hkynchonella variabilis, Scbl. 





3. 



Gray limestone 



0 



4 



AmmonitesTurneri, ^ovi.,?indiAm.semicostatus,X.k'Q. 





4. 



Dark slaty marls 



4 



0 





' 5. Dark-gray limestone 1 0 



C. Black shales, with partings of 



gypsum 2 G 



7. Dark-grayisb limestone 0 10 



8. Dark-shale 2 0 



9. Hard gray limestone. " Gray 



Ledge" 1 3 



10. Dark shaly marls 2 0 



11. Gray limestone 0 6 



12. Dark indurated shale 3 6 



13. Bluish limestone 1 0 



14. Dark shales, containing indurated 



imperfect limestone 1 6 



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. 

 GryphcBa incurva, Sow. 



Fin-spines of Hybodus, Rhynchonella variabilis, 



Schloth, and Pentacrinus tuberculatus, Mill. 

 Ichthyosaurus platyodon, Conyb. 

 Spines of Pseudo-diadema, and other Eehinidce. 

 Ichthyosaurus platyodon, Conyb. 

 Gryphcea incurva, Sow., Rhynchonella variabilis, 



Schloth, audi Lima antiquata, Sow. 

 Ichthyosaurus communis, Conyb., /. platyodon, 



Conyb., Pentacrinus tuberculatus, Mill., and 



Lima gigantea, Sow. 



15. 



Bluish limestone 



0 



10 





16. 



Dark indurated clay 



1 



3 



Gryphcea incurva, Sow., and fragments of Penta- 

 crinus tuberculatus, Mill. 



17. 



Gray limestone, with the plant- 







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





bed at the top 



0 



6 



grinus, Sternb., in the plant-bed. 



18. 



Dark-bluisli limestone 



1 



6 



Ammonites Conybeari, Sow., and Rhynchonella 

 variabilis, Schloth. 



19. 





0 



8 



Gryphcea incurva, Sow. 



