42 



THE LIAS AMMONITES. 



Horizon. 



Petrology. 



Paleontology. 



Lower Series. 



Black, crumbling 

 shales, covered by 

 thin, earthy, shelly 

 limestones, 19 feet 

 thick. 



Arietites Conybeari, Eucyclus elegans, Rissoa nana, 

 Turbo philemon, Discohelix Oppeli, D. striata, Tan- 

 credia ovata, Plicatula Hasina, Rhyn. plicatissima, 

 Montlivaltia Haimei, Galeolaria socialis. 



Middle Series. 



Soft blue shales, with 

 rows of small lime- 

 stone nodules in the 

 upper part, friable 

 shales, with shelly 

 bands, thickness 93 

 feet. 



Arietites bisulcatus, Aegoceras Charmassei, Cryptcenia 

 solarioides, Turbo solarium, Cerithium gratum, Turri- 

 tella Dunkeri, Lima gigantea, Unicardium cardioides, 

 Cardinia crassiuscula, C. concinna, C. Listeri, Hippo- 

 podium ponderosum, Gryphcea arcuata, Lucina lim- 

 bata, Pecten lextorius, Montlivaltia Guettardi. 



Upper Series. . 



Earthy limestones, and 

 calcareous shales, 

 with agillaceous beds, 

 thickness about 66 

 feet. 



Arietites Turneri, A. semicostatus, A. Sauceanus, 

 JBelemnites acutus, B. in/undibulum, Cardinia Listeri, 

 Grypkcea arcuata, Lima gigantea, Pecten Thiollieri, 

 Monotis incequivalvis, Spiriferina Walcotii, Acrodus 

 nobilis. 



Ichthyosaurus communis, Conybeare. 

 — intermedius, Conyb. 



Talaontology of the Bucklandi Zone. 

 Reptilia. 



Ichthyosaurus platyodon, Conyb. 

 — tenuirostris, Conyb. 



Pisces. 



Ichthyodorulites of Hybodus reticulatus, Agass., and teeth of Acrodus nobilis, Agass. 



Cephalopoda. 

 Arietites Bucklandi, Sow. 



— bisulcatus, JBrug. 



— Conybeari, Sow. 



— Sauzeanus, a" Orb. 



— semicostatus, Young fy Bird. 



— Brooki, Sow. 



— Scipionianus, d'Orb. 



— rotiformis, Sow. 



Pleurotomaria similis, Sow. 



— Hennocqui, Terq. 



— concava, Mart. 



— tectaria, Tate. 

 Cryptsenia solarioides, Sow. 



— rotellseformis, Dunk. 

 Actseonina, fragilis, Dunk. 



— sinemuriensis, Mart. 

 Turbo solarium, Piett. 



Aegoceras Charmassei, d'Orb. 

 Amaltheus Greenoughi, Sow. 

 Nautilus striatus, Sow. 

 Belemnites acutus, Mill. 



— pencillatus, Sow. 



— calcar, Phil. 



— infundibulum, Phil. 



Gasteropoda. 



Turbo philemon, d'Orb. 



— reticulatus, Moore. 



— Wilsoni, Tate. 

 Rissoa nana Mart. 

 Phasianella Morencyana, Piette. 

 Pitonellus sordidus, Tate. 

 Eucyclus elegans, Mihnst. 



— selectus, Chap, $• Dewalq. 

 Trochus Redcarensis, Tate. 



