394 



PALAEONTOLOGY 



9. UPPER DEVONIAN AMMONOID ZONES. 



A much more detailed scheme of zones, comparable 

 with the zones of the older Palaeozoic or Mesozoic, has 

 lately been established by Dr. Wedekind of Gottingen 

 for the Upper Devonian of Germany. 



Stages. 



Zones. 



FRASNIAN 



/ VII. 



FAMENNIAN .. 



VI. / 



Gonioclymcnia 



V.'-! Clymenia cf. undttlata 



\Clymenia lavigata 



IV/3. Postprolobites yakelowi and Clymenia ttnui , 



cost at a 

 IVa. Clymenia crassicosta and Prolobites delphinns 



HI/3. Clymenia invohtta 

 Ilia. Tornoceras sandbergeri 



11)3. Cheiloceras and Dimeroceras 

 Ha. Cheiloceras 



Id. Crickites holzapfeli and Manticoceras crassiim 

 I-y. Manttcoceras carinatum and Manticoceras cot' 



datum 



Ij8. Manticoceras nodulosum 

 la. Prolecanites lunulicosta 



Zones la 6 correspond to 7 and 8 of the preceding list ; I la and /3to 9 ; Ilia tc 

 V. to 10 ; VI. and VII. ton. 



