MINERALS AND GEOLOGY OF CANADA. 455 
series: a comparatively deep-sea deposit, the .‘‘ Leda clay ;’’ and a 
shallow-sea or shore-lime deposit, the ‘Saxicava Sand.’”’ Some of 
the more characteristic fossils of the Leda clay, comprise : Leda Port- 
landiea, and: Rhynconella psittacea; and those of the upper group: 
Saaicava rugosa, Mya truncata, Tellina. grenlandica, and Buecinum. 
undatum.* 
Fig. 243. Fig. 243, Fig. 244, 
Eeda Portlandica, Rhynconella psittacea. Saxicava rugosa. 
Fig. 245. 
Fig. 246. Fig. 247. 
Tellina grenlandica. Buccinum undatum. 
* The reader is referred for figures of the other fossils of these Post-glacial deposits, to 
valuable papers, by Dr. Dawson, in the Canadian Naturalist, vols. 11. and IV. Also to an 
earlier paper on the same subjeet, by Mr. Billings, in the first volume of that journal. ; 
