

Vol. 52.] 



PLIOCENE DEPOSITS OF HOLLAND. 



Table C. 



759 



Species of Mollusca, principally Northern or .Recent, found in the 

 Amstelien or the Upper Red Crag, hut not at Walton or in the 

 Scaldisien of Belgium. £N".A. = North American.) 





d 



g 



< 



73 



« . 



P 









 s- 



< 



+ 



+ 



+ 

 + 



+ 



+ 

 + 



+ 

 + 



6 



o9 



a 

 ^8 



S3 



e8 



CO 



+ 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 



+ 



+ 

 + 

 + 



• 



00 



< 



T3 



a . 

 &:° 



+ 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 



+ 



6 



+ 



+ 



+ 



+ 

 + 



a 



ce 



"g 



c 

 cs 

 



CO 



N.A. 

 + 

 + 



+ 

 + 



Gasteropoda. 



Buccinum groenlandicum, Chem. 

 12 Trophon antiquus, TAnn. 



„ despectus Linn. ... 



+ 



+ 

 + 

 + 

 + 

 + 

 + 

 + 



+ 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 



Pelbcypoda. 

 Modiola modiolus, Linn 



Leda lanceolata, Sow 



,, myalis, Couth 



+ 

 + 

 + 









,, hyperborea, Loven 



,, scalariformis, Gould 



Pleurotoma pyramidalis, Strom. 



,, violacea, M. & A. ... 



+ 



Loripes divaricatus, Linn 



Cardium groenlandicum, Chem. . 

 2 Astarte compresaa, Mont 



+ 

 + 



Tellina lata, Gmel 



1 „ obliqua, Sow 



+ 

 + 



Seal aria gruenlandica, Chem. . . . 

 Littorina littorea, Linn 



+ 



1 „ prcetenuis, Leathes 



Macfra ovalis, Sow 





2 Natica clausa,~B. & S 



+ 



1 Solen siliqua, Linn 



+ 



„ gruenlandica, Beck ... 



Brachiopoda. 

 Ehynchonella psittacea, Chem. . 







Melampus fusiformis, Wood ... 





I do not think that the facts which I have stated leave any room 

 for doubt that the Scaldisien and Poederlien of Belgium are equi- 

 valent to the Walton stage of the Red Crag, and not to the whole 

 of that formation, and that the Butley horizon of the Red Crag is 

 not represented in Belgium at all. I hope to show, however, that 

 its equivalent exists in Holland. 3 



While the Belgian area had thus been converted into land, and in 

 England the sea had retreated northward from Walton before the 

 deposition of the later beds of the Crag, an entirely different state 

 of things obtained in Holland. There the sea-bottom was subsiding, 

 and we must have in the subsoil of that country a continuous series 

 of the beds deposited during the progress of the subsidence, equiva- 

 lent to different stages of the English Crag. 4 We do find the same 



1 These have been found in the Poederlien, but not in the Scaldisien. 



2 Mr. Kendall has obtained one or two specimens of each of these at Walton, 

 as the result of many weeks' work. On the other hand, a number of the 

 species in this list are among the more abundant forms of the Upper Red Crag 

 and of the Amstelien. 



3 Since the above was written, I have noticed that a similar opinion was 

 expressed in 1872 by Mr. A. Bell, Geol. Mag. p. 21L 



4 In Belgium a break undoubtedly exists between the Diestien and the 

 Scaldisien ; but, for the reasons stated, it may have been otherwise in Holland. 



