Post-Pliocene Deposits of the St. Lawrence. 25 



scribed a number of species of fossils from Logan's farm, and 

 stated what I believed to be their relative position. By the kind- 

 ness of Mr. Logan, I have since been enabled to make an exca- 

 vation in the spot where these remains are most abundant, and 

 obtained the following section : — 



ft. in. 

 Soil and sand, 1 9 



Tough reddish clay, 0\ 



Gray sand, a few specimens of Saxicava rugosa, Mytilus edulis, 

 Tellina Grcenlandica, and Mya arenaria, the valves generally 

 united, 8 



Tough reddish clay, a few shells of Astarte Laurentiana, and Leda 



Portlandica, 1 1 



Gray sand, containing detached valves of Saxicava rugosa, Mya 

 truncate^ and Tellina Grcenlandica ; also Trichotropis bore- 

 alis, and Balanus crenatus : the shells in three thin layers . 8 



Sand and clay, with a few shells, principally Saxicava in de- 

 tached valves 1 3 



Band of sandy clay, full of Natica clausa, Trichotropis borealis, 

 Fusus tornatus, Buccinum undatum, Astarte Laurentiana, 

 Balanus crenatus, &c. &c, sponges and Foraminifera. Nearly 

 all the rare and deep-sea shells of this locality occur in this 

 band, 3 



Sand. and clay, a few shells of Astarte and Saxicava, and remains 



of sea-weeds with Lepralia attached ; also Foraminifera, ... 2 



Stony clay, boulder clay. 



It thus appears that at Logan's farm we have littoral species at 

 top, and that all the rare and deep-water fossils, as well as the 

 Lepralice and Foraminifera occur in a comparatively thin band 

 near the base of the deposit. This corresponds precisely with the 

 order observed elsewhere in the vicinitv of Montreal ; tliouuh at 

 Logan's Farm the arrangement is somewhat more complex than 

 in other localities. 



Tanneries. — At the brick-vards near the village of the Tanne- 

 ries, near Montreal, the surface of the Leda clay is well stored 

 with Leda Portlandica, Astarte Laurentiana, Natica clausa 

 Tellina Grcenlandica, and some other shells. It also contains 

 sponge spicula and foraminifera. The shells at this place, though 

 by no means so numerous as at Logan's farm, are remarkable lor 

 their excellent state of preservation. 



Beauport. — I visited this celebrated deposit for the first time 

 last autumn. At first sight it consists of a mass of stratified sand 



