ZONE OF AMMONITES BUCKLANDI. 



69 



s 



•5S 





'20. Dark-grnvish limestone 10 



21. Dark slinle 8 



22. Gray limestone 4 



23. Dark sliale 1 



24. Dark-grayish limestone 1 4 



25. 



(26. 

 27. 

 28. 



29. 

 30. 

 31. 



Hard shale, forming " Quick 



Ledge" 1 6 



Blue limestone 6 



Dark shale 8 



Concretionary limestone (surface 



mammillated) 4 



Dark-gray shale 8 



Grayish limestone 6 



Dark indurated shale 9 



32. Hard gray limestone 7 



Ammonites Bucklandi, Sow., and Am. rotlforniis, 

 Sow. 



Ichthyosaurus temiirostris, Convb. 

 Ichtht/osannts communis, Conyh., skulls and bones of 

 other species, and ZWyncAone^/a variabilis,^c\\\ot\\. 

 Ichthjosaurus communis, Gonyb., and /. intermedins, 



Couyb. 

 Ammonites BucHandi, Sow., and Lima gigantea, Sow. 

 Gryphcea incwva, Sow., and Rhynchonella variabilis, 

 Schloth. 



Ammonites angulatus, Schloth. 

 Lima gigantea, Sow., and L. antiqnata. Sow. 

 Ammonites angulatus, Schloth (large specimens). 

 Gryphwa incurva, Sow., small and dwarfed. 

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



The shingle of the shore covers the lower beds. 



Coast of GJaiuorganshire. — In Glamorganshire there is an extensive exposition of the 

 Am. Bucklandi and Lima series for the distance of sixteen miles along the coast, from 

 Penarth Head, by Barry Island, Aberthaw, and Dunraven Castle to the mouth of the River 

 Ogmore, where the Lower Lias rests on upturned beds of Carboniferous Limestone. The 

 strata chiefly laid bare by the sea are those containing Lima gigantea and Gryphcea incurva. 

 At Cowbridge the same lithological relations are observed, and the Lower Lias here rests 

 on Carboniferous Limestone. 



At Penarth Head, however, the relation of the Am. BncMandi series to the Am. 

 jplanorhis and Avicula contorta beds is much better seen than at any other part of the 

 Glamorganshire coast. 



Fossils of the zone of Ammonites Bucklandi. — The fossils of the zone of Ammonites 

 Bucklandi are numerous, and in general in a good state of preservation. 



Ichthyosaurus communis, Conyb. 



— intermedins, Conyh. 



— platyodon, Conyb. 



— tenuirostris, Conyb. 

 Ichthyodorulites of Hybodus. 

 Ammonites Bucklandi, Sow. 



— Conybeari, Sow. 



— rotiformis, Sow. 



— angulatus, Schloth. 



— Greenoughii, Sow. 



— tortilis, d'Orb. 



Nautilus striatus. Sow. 

 Pleurotomaria similis. Sow. 

 Ostrea irregularis, Miinst. 

 Gryphsea incurva. Sow. 

 Unicardium cardioides, Phil. 

 Pecten textorius, Schloth. 

 Lima gigantea, Sow. 



— antiquata. Sow. 



— pectinoides. Sow. 

 Modiola Hillana, Sow. 

 Avicula Sinemuriensis, d'Orb. 



