232 



Otozamites parallelup, Pliill. 



,, Feistmanteli, Zigno. ' 



Williamsonia gigas, Lind. and Ilutfc. 



„ pecten, Phill. 



Dictyozamites Hawelli, Seward. 

 Nilssonia compta, Phill. 



„ mediana, Leckenby. 



,, tenninervis, Nathorst. 



Strobilus ? 



Gingko digitata, Brongn. 

 Gymnosperm Seed (Beania 1) 



So far, then, we have seventeen species, fourteen of which we 

 may regard as having been identified with certainty. Since the 

 Miilepore Bed is not present in the Marske area, and the Lower and 

 Middle Estuarines consequently must apparently be regarded as 

 forming a continuous deposit, it becomes interesting to enquire 

 whether the plants found here have the fades of the distinctive 

 flora of either of these divisions of the Yorkshire Bajocian. Of 

 the fourteen plants Didijozamitea HaweJIi is new, and Otozamites 

 FeistiiianteU does not appear in the published lists, while Equisetites 

 coluumaris, Twniopteris a'ftata and Williantsonia peden are plants 

 -occurring in both the Lower and Middle series of Estuarine 

 deposits. Of the remainder there are only two which are recorded 

 from the Upper Beds alone, viz., WiUianisom'a gi;/as and Otozamites 

 jjaralldus, the only locality for both of which is Whitby. On the 

 other hand there are seven which are recorded from the ]\Iiddle 

 Estuarines alone, viz., CladophJehis denticuJata (Gristhorpe), Tceni- 

 op)teris major (Gristhorpe), Sagenopterix PhUlipsi, (Gristhorpe), 

 (I am not sure where the var. major came from which alone appears 

 to be present at Marske), Nilssonia compta (Gristhorpe and 

 C\o\\g\\ion), Nihsonia mediana (Gristhorpe and Cloughtoni, Nih- 

 sonia tenuinerds (Cloughton), and Cringko digitata (Gristhorpe). 

 It will thus T)e seen that the Marske flora has on the whole a j\Iiddle 

 Estuarine facies, some ])lants, such as Nilssonia tenuinerds which 

 have never been recorded from the Lower Estuarines being extremely 

 abundant. 



I have stated that most of my plants have been obtained from 

 a spoil heap, but on the same slab several species are often con- 

 fusedly intermixed, and I do not think it will be possil^le in the 

 Marske quarry to trace any zonal succession of forms. Still I shall 

 attempt to do this, and at the same time to trace and Avork out the 

 plant beds in other parts of the Cleveland district. Equisetites 



