EUROPEAN LOWER LIAS ZONES. 



65 



and 50. A few specimens of jEchmodus were found in the marls above the Belemnite- 

 beds at Golden Cap, but few remains are known in other beds of the Middle Lias. 



A Table showing the extension of the Lower Lias in the British Islands, Belgium, France, 

 Switzerland, Germany, Austria, and Ltaly, loith indications of the Sinemurian Am- 

 monite Zones, found in some typical regions of the European area. 



Ammonite Zones 



of the 



Lower Lia8. 



British Islands. 



-a 



s 





RARICOSTATUS 



OXYNOTUS 



OBTUSUS 



TURISERI 



BUCKLANDI 



ANGULATUM 



PLANORBIS 



AVICULA CONTGRTA 



g 



5 



w 



-3 



a 



-a 



c 



6D 



3 



S 

 v 



X 



s 

 1-3 



France. 



o 





o; 



<u 



^ 



a 



O 



a 



o 



02 

 O 



3 



»3 



Germany. 



C3 



be 



:3 



... 



* 



* 



... 



... 



* 



* 



... 



* 



* 



* 



... 



« 



« 



* 



* 



* 



* 



* 



* 



* 



« 



« 



* 



» 



* 



* 



* 



1= 





* 



* 



» 



... 



» 



* 



* 



» 



* 



... 



* 



... 



« 



* 



* 



» 



* 



» 



# 



* 



* 



a 



cS 

 u 



QQ 



s 



My learned friend, Professor Edward Suess, of Vienna, whose valuable and sug- 

 gestive memoir " Tiber die Ammoniten "^ formed the basis of the new generic classification 

 of Ammonites, writes to me, " we have now discovered a number of Ammonite horizons 

 only a few inches in thickness, as for example the Aeg. planordis 18 inches, Aeg. 

 angulatum 20 — 36 inches, upon thousands of feet of Rhaetic deposits in the midst of our 

 Alps. This contiguity of single horizons surely gives the Jurassic formation, or at least 

 a part of it, a character rather different from other European deposits, and well worth the 

 exact analogies which you offer." 



1 'Sitzungsber. d. k. Akad. d. Wissensch.,' Bd. lii, Sitzung vom 30 Juin, 1865. 



9 



