24 INTKODTJCTION. 



Liassic rocks of the north arm of this area have afforded 

 a particularly rich flora, which has heen described in 

 detail by Schenk l ; this flora is referred to later. 



2. North- West Germany- from Helmstedt and Quedlinburg to 



the Teutoberger Wald. Several Wealden species have been 

 described from this region. 8 



3. Upper Silesian Jura. A belt thirty miles long, from Cracow 



to Kalisch. 



Kurr 3 has described a few species of plants from the Swabian 

 Jura, which suggest a Liassic horizon ; a few of these may be 

 compared with East Yorkshire species : 



Zamites MandelsloM, Kurr; cf. Otozamites parallelus (Phill.). 

 Zamites gracilis, Kurr; cf. small forms of Williamsonia pecten (Phill.). 



From the Solenhofen beds in Franconia, 4 which are classed with 

 the Upper or White Jura, several plants have been recorded, 

 especially species of conifers. 



The fossil flora of Bamberg, Bayreuth, and other localities in the 

 Franconian area is one of the richest in Europe. Plants from these 

 localities have been described by Steinberg, Goppert, Braun, and 

 others, but it is to Schenk 5 that we owe the most complete account 

 of this Rhsetic-Lias flora. Attention has been called by Braun, 6 

 and more recently by Nathorst, to the close agreement or even 

 identity of many of the Franconian plants with species of Lower 

 Oolite age from East Yorkshire. The following list includes such 

 species as illustrate most clearly the marked Lower Oolitic facies 

 of the Keuper and Lias flora. 



F.quisetites Muensteri, Sternb. ; cf. E. columnaris, Brongn. 



Eaiera teeniata, Braun ; cf . Eaiera fhillipsi, Nath. (Some of the examples of 

 B. taniata figured by Schenk are identical with Yorkshire specimens ; e.g., 

 cf. pi. ix. fig. 4 of the present volume, and Schenk's pi. v. fig. 2.) 



Jeanpaulia Muensteriana (Presl) ; cf. Eaiera gracilis, Bunb. (cf. pi. ix. fig. 3, and 

 Schenk, pi. ix. figs. 7 and 10). 



1 Schenk (67). 



2 Vide Seward (94), pp. xviii. et seq. 



3 Kurr (45). 



4 linger (52) ; Thiselton-Dyer (72 1 ) (72 2 ), etc. 

 6 Schenk (67). 



Braun (43). 



