POST-TERTIARY POSSILIFEROUS DEPOSITS. 



29 



111 sections made during the formation of Windmillcroft Dock, Mr. J. Binnie 

 discovered in the Upper Sands, extending from a few feet to a depth of twenty-two 

 feet, numerous portions of the epidermis of JJnio margaritifera. " A few of them," he 

 writes, " had belonged to single valves, and in one or two instances the epidermis of 

 both valves was flattened together ; but the greater number were lying in their natural 

 position toith the umhonal portion undermost, proving that they had lived and died in the 

 gravel and had not been drifted down by a spate. 



A bed of clay containing marine Ostracoda, together with such arctic Mollusca as 

 Leda pernula and Tellina calcarea, succeeded this river-drift, and was found to rest upon 

 a bed of white sand of considerable thickness and extent (not exhausted in nineteen 

 feet of dredging between the piles at the entrance of the dock), and containing some 

 polished and striated boulders. Mr. J. Binnie quotes the " Journal of a Bore for an 

 Artesian Well " made at McPhail Street, Greenhead :^ 



Surface soil 

 Coarse sand 

 Clay mixed with sand 

 Coarse sand 



River- drift 

 Good clay 

 Muddy clay 



Marine clay 



Soft running sand with gravel 

 Whinstone block 

 Sand and gravel 

 Sandstone block 

 Sand and gravel 



White sand series, probably marine 



5 ft. 0 in. 



1 6 



2 0 

 2 6 



lift. Oin. 



8 



30 



0 

 0 



38 0 



51 

 2 

 7 

 0 

 1 



0 

 4 

 0 



61 



'■'2 



110 ft. 91 in. 



Over a large district, around Glasgow, and connected both with the ancient course 

 of the Clyde and the probable flow of glacial rivers during the period of the elevation 

 of the land, the deposition of the Boulder Clay (similar in character to that upon 

 which the Paisley shell-beds rest, and which crowns eminences such as Garnet Hill 



1 ' Trans. Geol. Soc. of Glasgow,' vol. ii, part ii, p. 109. ^ ibid., part iii, p. 265. 



