16 POST-TERTIARY ENTOMOSTRACA. 



The following Ostracoda were found : 



Cythere concinna, Jones. 

 Cytheridea puncfillata, Brady. 



3. Tangy Glen, near CAMPBELToWiV. 



In Tangy Glen, about six miles from Campbeltown on the road to Tarbert, about 

 300 yards up the little stream, at a point where it turns eastwards, and 130 feet above 

 the sea-level, the water has cut deeply into the bank, exposing a cliff of Boulder Clay 

 rising to the height of upwards of 100 feet. 



This Boulder Clay is of the most pronounced type, stiff, compact, and full of liighly 

 striated stones of various sizes. At one part a finer or more sandy bed^ gradually 

 thuming out, is intercalated with the clay ; and such lenticular beds are not uncommon 

 in tlie Boulder Clays of the West of Scotland. Within this Boulder Clay, and covered by 

 it, a stratified shell-bearing clay is seen standing up like a boss or knoll, and has doubtless 

 been brought to this form by abrasion. At the point of greatest exposure it is thirteen feet 

 high ; and it can be traced, as it thins down along the edge of the streamlet, for a distance 

 of sixty or seventy yards. The exact depth could not be ascertained ; but, as the rock 

 is seen at a short distance on either hand, it is probably not more than a few feet deeper 

 than the actual exposure, and we could detect no Boulder Clay beneath it. The shell- 

 bearing clay is dark grey in colour, and contrasts strongly with the underlying Boulder 

 Clay, which is of a full reddish-brown. 



Boulder Clay. Shell-bearing Clay. 



50 per cent, fine mud. 80 per cent, fine mud. 



27 „ sand (21 fine, C coarse). 14 ,, fine sand. 



23 „ gravel. 6 „ gravel. 



The fossils in this deposit are but sparingly met with — Mollusca especially are com- 

 paratively rare — Leda pyymaa being the prevailing shell, with an occasional Ze^r/jyera^z/cf, 

 Venus ovata, Corhula yihha. Some species, however, are of an extremely Arctic character, 

 and while somewhat common in the glacial beds on the east coast, are very seldom met 

 with in the west of Scotland. Pecten Grcenlandicus, e.g., is common at Montrose, Errol, 

 and Elie, but in the west we have only seen it at Tangy. It is remarkable that at Mont- 

 rose it is only obtained at a great depth, seldom less than thirty or forty feet, but at Elie 

 it is found only a few feet beneath the surface and within reach of the tide, and in neither 

 of these cases beneath the Boulder Clay ; while at Tangy it is beneath Boulder Clay, and 

 130 feet above the present sea-level. 



