POST-TERTIARY FOSSILIFEROUS DEPOSITS. 



43 



Cythere lutea, Miiller. 



— limicola (Norman). 



— villosa (G. O. Sars). 



— angulata (G. O. Sars). 



— concinna, Jones. 



— iuherculata (G. 0. Sars). 



— Dunehnensis (Norman), 

 Cytheridea jjapillosa. Bosquet. 



— pundillata, Brady. 

 Loxoconcha tamarindus (Jones). 

 Cytherura nigrescens (Baird). 



— widata, G. O. Sars. 



— clathrata, G. 0. Sars. 

 Cytherojjteron angulatum, Brady and Robertson. 



— latissimum (Norman). 



II. Garvel Pakk New Dock, Greenock. 



The dock, in the construction of which the fossihferous deposit was found, runs very nearly 

 parallel with the Clyde, and was cut through a slightly inclined bank of compact Boulder 

 Clay about sixty yards from the shore. The bottom of the section is forty feet beneath 

 the surface. The first ten or fifteen feet are crowded with large boulders, many of them 

 striated on one or more sides. Towards the bottom boulders of large size are fewer, one 

 only being seen here and there ; but the clay is closely packed with small pebbles, few of 

 them exceeding an inch in diameter. The great majority of the larger boulders are sand- 

 stones from the immediate neighbourhood, the remainder being of quartz, mica-schist, 

 &c., from the Argyleshire mountains to the north-west. The blocks derived from 

 a distance not unfrequently show much cross striation. The Boulder Clay is of such 

 stiff consistence that gunpowder has comparatively small effect upon it. 



The deep section of the dock is about 500 feet in length, and the colour of the clay 

 varies, the junction of grey and reddish-brown clays at some points being very decidedly 

 marked both vertically and horizontally. At one place the red clay, in the form of an 

 obtuse inverted cone, reaches nearly to the bottom of the section ; and this fact accounts 

 for the irregular position of the red and grey clays as described in the "journal of the 

 bores." The reddish colour of the Boulder Clay is, without doubt, due to a large 

 admixture of the soft Old Red Sandstone of this portion of the coast. 



