POST-TERTIARY FOSSILIFEROUS DEPOSITS. 



69 



23. Trrally Brick-works, Fourteen Miles from Si'ranraer, on the South-east 



OF THE Mull or Galloway. 



This deposit is of the same general character as at Cleshmahew's except tliat the 

 undermost bed retains the water instead of being porous. It is also remarkable for the 

 prevalence of a highly Arctic fauna. 



Leda arctica (Torell) is associated with Z. 2yy(/m(Ta. 



The shell-clay consists of 97 per cent, fine mud, 2 per cent, of sand, and 1 per cent, 

 of gravel. 



Height above the sea forty- five feet. 



The following Ostracoda have been found : 



Cypris (/ibba, Ramdohr. 

 Cythere limicola (Norman). 

 Limnicythere antiqua, n. sp. 

 Cyfheridea papiUosa, Bosquet, 

 — pimctillata, Brady. 

 Cytherura undata, G. 0. Sars. 



24. Port Logan Cliffs. 



Port Logan cliffs are about one mile from Terally on the opposite side of the Mull. 

 The shell-clay rests/immediately on the rock, and rises to the height of twenty feet. It is 

 very stiff, and is overlain by a few feet of gravel. 



The dry clay consists of 50 per cent, of fine mud, 46 of sand, and 4 of rounded and 

 well polished gravel. 



The shells are fragmentary and water-worn ; they are scattered over the whole face 

 of the deposit, and not confined to any particular layer in the section, as we see them in 

 those sections where they have lived and died. 



Only three species of Mollusca could be determined, viz. Astarte sulcata, Leda pernula, 



