ZONE OF AMMONITES BUCKLANDT. 



G9 



g 

 o 



"2 

 S 



"Si 



20. 



21. 

 22. 



23. 

 24. 



26. 

 27. 

 28. 



29. 

 30. 

 31. 



32. 



Dark- grayish limestone 0 10 Ammonites Bucklandi, Sow., and rotiformis, 



Sow. 



Dark shale 0 8 



Gray limestone 0 4 



Dark sLale 1 0 Ichthyosaurus tenuirostris, Conyb. 



Dark-grayish limestone 1 4 Ichthijosaurus communis, Conyb., skulls and bones of 



other species, and 7?/i!y/?c/!0?ieZ/a i^«r/«i(7*s,Scliloth. 

 Hard shale, forming " Quick . Ichthyosaurus communis, Conyb., and /. intermedins. 



Ledge" 1 6 Conyb. 



Blue limestone 0 G Amtnonites Bucklandi, Sow., nnd lima ffiganfea, Sow. 



Dark shale 0 8 Gryphcea incurva, Sow., and Rhynchonella variabilis, 



Concretionary limestone (surface Schloth. 



mammillated) 0 4 



Dark-gray shale 0 8 Aynmonites angulatus, Schloth. 



Grayish limestone 0 6 lima giyantea, Sow., and L. antiquata, Sow. 



Dark indurated shale 0 9 Ammonites angulatus, Schloth (large specimens). 



Gryphwa incurva. Sow., small and dwarfed. 

 Hard gray limestone 0 7 lima gigantea. Sow., andX. antiquata, Sow. 



The shingle of the shore covers the lower beds. 



Coast of Glantorgansliire. — 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 Z/w« 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. Buclclandi series to the Am. 

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

 Glamorganshire coast. 



Fossils of tlu' zone of AmmomiQ^J^\\c\A?^\\^i\. — The fossils of the zone of Ammonites 

 Buckla?idi are numerous, and in general in a good state of preservation. 



Ichthyosaurus communis, Conyb. 



— intermedius, Conyb. 



— 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, Milnst. 

 Gryphsea incurva, Sow. 

 Unicardium cardioides, Phil. 

 Pecten textorius, Schloth. 

 Lima gigantea, Soio. 



— antiquata. Sow. 



— pectinoides, Soiv. 

 Modiola Hillana, Sow. 

 Avicula Sinemuriensis, d'Orb. 



