I860.] 



WEIGHT — LIAS. 



401 



LlTHOLOGY. 



No. 



Tliickness. 

 feet. 



Organic Remains. 



Black shales. 



8. Band of limestone 20 



7. Nodular limestone. 



Black shales 15 



6. Dark limestone 10 



Dark shale. 



•{ 5. Dai*k limestone 



Dark shale. 

 4. Greenish brown soft ? 



Marlstone. 

 3. Pale-bluish clay, with 



plant-like fibres 5 



2. Buff-coloured clay. 

 1. Grey sandy marlstone, 

 with ferruginous spots. 

 New Bed Marl. 



Fishes' scales ; layers of compressed 

 Pullastra arenicola, Strickl. 



Pecten Valoniensis, Defr., and Avicula 

 contorta, Portl. 



Pullastra arenicola. 



Lyme Regis. — The zone of Ammonites Bucklandi is admirably 

 exposed in the coast-section at Lyme Kegis in Dorset, both in the 

 Church Cliffs and at Pinhay Bay, where the beds consist of a series 

 of grey 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 folio-wing section, from the lowest bed on the shore to Broad 

 Ledge, which may be considered as the uppermost bed of the Am. 

 Bucklandi or Lima series, affords a correct view of the stratigra- 

 phieal order of these strata and of the fossils they contain. 



Section of the Ammonites Bucklandi or Lima beds from Broad Ledge 

 to the sJiore at Lyme Bey is. 



No. 



LlTHOLOGY. 



ft, in. 



o 



w 



=■= 



1. Dark -grey limestone. 

 "Broad Ledge" or 

 "Tuble-bed" 3 <5 



2. Dark marls and shales, 

 with bands of clays 15 



3. Grey limestone 4 



4. Dark slaty marls 4 



' 5. Dark-gri_\ limestone 1 



0. Black shales, with part- 

 ings of gypsum 2 G 



7. Dark-greyish limestone . 10 



8. Dark shale 2 



'.». Hard grey limestone. 



" Grcv Ledge" 1 •'{ 



10. Dark shaly marls 2 



11. Grey limestone 6 



12 Dark indurated shale •"> 8 



Organic Remains. 

 Rhpichonilla variabilis, in masses. 



Ichthyosaurus communis, I.platyodotU, 



Ammonites ssmicostatus, Y. & B., 

 and EhynehonsUa variabilis, BohL 

 Ammonitea I i,Bow. l ua&Am.a$~ 

 micostatus, Y. & B. 



Lima giqanfca, L. antiquata, and 



Rkjfncnom Ua variabilis. 

 Ichthyosaurus c ommu ni s (in the " Bre- 



stono-beds" west of the Col>l>). 

 Lima giaantea, L. antiquata, and 



BhjfnchoneSa variabilis. 



(irt/pluva inrurrti, SOW. 



Fin-spines of Hybodus, RhynchonsUg 

 variabilis, and Psntaerintu (stem). 

 Ichthyosaurus platyodon. 

 Spines of Pseudo-iliadenui, and other 



nllV. 



Ichthyosaurus platy 



