POST-TERTIARY FOSSILIFEROUS DEPOSITS. 



67 



The following Ostracoda were found 



Cythere latea, Miiller. 



— concinna, Jones. 

 Cytheridea punctillata, Brady. 

 Cytherura gihha (Miiller). 

 Cytheropteron latissimum (Norman). 



— angulatum, Brady and Robertson. 



Sclerochilus contortus (Norman). 



21. LucKNOw Pit, Ardeer Iron-works, Ayrshire. 



Although we could obtain no material from this pit to examine for Ostracoda, it is of 

 importance to record the section as illustrating the existence of a younger fossiliferous 

 bed (represented by the Peden maximus bed in the Kyles of But« and the Irvine water 

 bed presently to be described) resting upon an older Arctic bed. 



The section obtained during the sinking of the pit was the following : 



Sand, about 



Moss . 



Sand , 



Shell-mud, or blue loamy sand 



Blue clay 



Sandstone rock . 



The shells brought to the surface belonged to two entirely different groups. The one 

 group was eminently Arctic, including Leda arctica, Jstarte borealis, Tellina calcarea, 

 Natica affinis [clcmsa). 



The other group embraced a numerous collection of species precisely similar to those 

 found in the post-glacial bed in Irvine water. In this group Ostrea edulis is abundant 

 and associated with Cardium edule, C. Norveyicum, C. echinatum, Tapes jmllastra, 

 T. decussata, Lutraria ellipiica, Peden opercularis^ Trochus magnus. 



. 12 ft 



. 



in 



1 



6 





. t^ 



6 





. 6 









. 6 









