130 



THE LIAS AMMONITES. 



cormus, Tlirissops, Leptolepis. Saurians, as Ichthyosaurus, Plesiosaurus, and Teleosaurus. 

 Ceplialopods, as Rarpoceras serpentinum, bifrons, Lythense, PJiylloceras heterophyllum, 

 Lytoceras cornucopia, Belemnites acuarius. Lam^Uibranclis, as Inoceramus dubius, 

 Posidonia Bronni, Minotis substriatiis, Leda ovum ; and Bracliiopods, as Biscina refleaia, 

 and others. T^e." Jurensis-Iferyel" is characterised by the absence of Fish remains 

 and the appearance of a new suite of Cephalopods, as Lytoceras jurense, Harpoceras 

 insigne, variabile, striatulmn, radians, Aatense, and many others. 



At Pliensbach, north-west of Boll, and Holzmaden, south-west of Kirchheim, the 

 following section by Dr. Oppel may be considered as typical of the Wiirttemberg Upper 

 Lias, 



Ujjper Lias near Boll, Wurttemberg . 

 Toridosus-b&d. 



Petrology. 



Thick- 

 ness. 



Organic Remains. 



Zone of 



Lytocekas 



JDEENSB 



Zone of 

 posidonomya > 

 Beonni 



' Two or three light grey, 

 hard, marl beds, with 

 clays between 8 to 



^ Efflorescent slaty shales, re- 

 placed in many places by 

 the so-called "Leberhoden" 



Monotis bed 



Slaty beds, abounding with 

 saurian and fishes' remains 



Slaty beds with Teleosaurus, 

 Pterodactyle, and fishes' 

 remains 



ft. 



10 



8 

 

 







1 







1 







2 







5 

 

 





 1 



in. 

 







2 



2 



5 

 

 8 

 

 4 







8 







8 

 2 



3-5 

 6 



Am. jurensis, discoides, insignis, radians, hir- 

 cinus, JBelemnites tricanaliculatus, exilis, 

 longisulcatus, irregularis. 



Am. lifrons, fihidatus, serpentinus, falcifer, 

 Jieterophyllus, cornucopia, communis, crassus, 

 Holandrei, subarmatus, Bel. irregularis, Bel. 

 tripartitus. 



Monotis substriatus, Miinst. 



Belemnites acuarius. 



Teleosaurus Chapmani, Pterodacf.ylus Ban- 

 thensis, Piycholepis Bollensis. 



Posidonomya, Bronni, Monotis substriatus. 



Leptolepis Hlvensis. 



Saurians, Pentaerinus Bollensis. 



Spiriferina villosus, Belemnites papillatus. 

 Sauriatis and Sepia. 

 Acrosalenia crinifera, Quenst. 



Light-grey slaty clay 



Upper " Stinkstein " 



Slates with fishesaud saurians 



Hard laminated clay ... 2 to 



Light efflorescent laminated 



slates 



Lower "■Stinkstein," with 

 fishes' remains 



Laminated slates, with 

 Geodes 



" Heins" 



liainzen pyritic nests 



Bluish-grey clay, with Alga: 

 Blackish Tafeljieins 









The Middle Lias.—. 



Zone of Am. sjiinatus? 



^ ' ' Juraformation,' p. 201, 185G. 



