ZONE OF AMMONITES TURNERI. 



71 



Saurian-beds. The magnificent specimen of IchfJiijosaurus plafpdon, Conyb., now in the 

 British INIuseiun, came from tliis chiy, as is proved by the impressions of Jni. semicostalus, 

 Y. & B., which are seen on the matrix. This thick clay-bed is underlain by a thin band 

 of grayish-limestone, in which yliii. Turneri is found. The following section of this zone 

 at Lyme Regis shows the sequence of the Am. Turneri beds at that locality. 



Section of the Zone of Ammonites Turneri at Lyme Be^is. 



LlTHOLOGY. 



Organic Remains. 





ft. in. 



3 



g\ 





n 



1. Thick limestone, "Broad Ledge" 



2. Black shales, with bands of brown 



clay. " Saurian- and Fish- 

 bed" 18 



3. Grayish, hard, shelly limestone ... 



4. Dark shales, with indurated bands 



of imperfect limestone 3 



Grayish limestone 



6 Ichthyosaurus platyodon, Conyb., I. communis, 

 Conyb., Ammonites semicostatus, Am. Turneri, 

 Sow., and Fishes. 







4 AmmonitesTurneri,8o'w., and Am. semicosfatus,Y.&B. 







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

 Rhynchonella variabilis, Scliloth. 



Beds with Am. SucJclandi and Lima gigantea. (See p. 68.) 



Fossils of tlie Zone of Ammonites Turneri. 



Ichthyosaurus platyodon, Conyh. (British 

 Museum). 



— intermedius, Conyh. (War- 



wick Museum). 



— communis, Conyb. (British 



Museum). 

 Ammonites Turneri, Sow. 



— semicostatus, T. ^ B. 



— Bonnardi, d'Orb. 

 Turbo. 



Lima punctata. Sow. 

 — ■ gigantea. Sow. 

 — pectinoides. Sow. 



Cardinia ovalis, Stutch. 



Ostrea. 



Avicula insequivalvis. Sow. 



Pecten textorius, Schloth. 



— glaber, Hehl. 

 Astarte consobrina, Dewal. 

 Crenatula, nov. sp. 

 Plicatula spinosa, Sow. 

 Gervillia lanceolata, Sow. 

 Gryphaea incurva. Sow. 

 Cidaris Edwardsii, Wr. 

 Pseudodiadema spines. 

 Pentacrinus tuberculatus, Miller. 



' I have omitted the fossil Fishes found in the Lias 

 with sufficient accuracy the beds from which the different 

 them, however, I believe, came from this zone of life. 



at Lyme Regis, as I was unable to ascertain 

 species were collected ; a large majority of 



