20 INTRODUCTION. 



The conditions under which the estuarine sediments of the 

 Yorkshire area were laid down are briefly dealt with in the con- 

 cluding pages of the Catalogue. As the present volume deals only 

 with the Inferior Oolite plants of East Yorkshire, the consideration 

 of the Stonesfield flora and of other Oolitic plants recorded from 

 various British localities is reserved for the second volume of the 

 Jurassic Flora Catalogue. 



JURASSIC PLANT-BEARING STRATA OF FRANCE, 

 GERMANY, AND OTHER COUNTRIES. 



The following incomplete account of extra-British Jurassic plant- 

 bearing strata is intended to draw attention to the principal floras, 

 which present a more or less close resemblance to that facies of 

 Jurassic vegetation represented by the plants from the Yorkshire 

 coast. In the following lists of plants the right-hand column is 

 intended to illustrate the resemblance or possible identity of British 

 species with species described from other countries ; a more detailed 

 comparison may be found in the descriptive part of the Catalogue. 



FRANCE. 



One of the earliest notices of French Jurassic plants occurs in 

 a memoir by Desnoyers 1 on the Oolite rocks of Mamers in the 

 department of Sarthe in the north-west of France, containing a few 

 notes by Brongniart on some species of fossil plants. 



Some years later Pomel 2 published a series of notes on Jurassic 

 plants from several localities and horizons, and proposed a large 

 number of new generic names, most of which have not been retained. 

 A small number of species is enumerated also by Brongniart in 

 his Prodrome* of 1828, and in the Tableau^ published in 1849; 

 but it is in the well-known volumes by Saporta 6 that we find 



1 Brongniart, in Desnoyers (24). 



* Pomel (49). 



3 Brongniart (28 1 ), p. 198. 



* Ibid. (49), p. 105. 



6 Saporta (73) (75) (84) (91). 



