J. H. Cooke — Geological Notes on Gozo. 



353 



nnable to discover any traces of a formation partaking of the 

 lithological characteristics of these pebbles, to which they might 

 have been referred. 



Proceeding down the valley in a westerly direction, four mounds 

 of blue and yellow clay (the marl beds of Spratt and Adams), are 

 to be seen resting conformably on the southern slope, at an elevation 

 of about 20 feet above the bottom of the valley ; and in two cases, 

 the black and yellow sands, that are invariably found to overlie the 

 stratum, are also present. 



On the summits of these clay-beds, there occur other patches of 

 the Pleistocene deposit; but unlike those portions that have just 

 been described, these are not in situ, but have been formed, ap- 

 parently, by the degradation of beds, that were originally deposited 

 higher up the slopes. The materials of which these cappings are 

 composed appear to differ but little from these of the other portions 

 of the bed, save in the total absence of perfect shells, and the 

 comminuted condition in which the fossil bones are found. Such 

 are the principal characteristics of the Pleistocene deposits that are 

 found along the southern slope of the Dueira valley. 



The following sketch shows the relative positions of the subdivisions. 



o o o Cb o o 

 O O <^0 O O 



o <3Q O O Q 



I- 



A. Greyish, non-crystalline, slightly indurated limestone. Helices and other land- 



shells occur in abundance ; but no Mammalian remains appear to be present. 



B . Limestone of a similar character to A, but interstratified with irregular layers of 



stalagmite. These layers vary from J to I of an inch in thickness. 



C. A layer of boulders and pebbles, all of which have apparently been derived from 



beds IV. and V. Some of the boulders measure eighteen inches, and two feet 

 in length ; and all of them are rounded, and otherwise much water-worn. 



D. Loam intermixed with quantities of smaller pebbles. Black limestone pebbles 



occur in this layer in abundance. 



E. A yellowish grey loam, similar in every respect to that which occurs at the base 



of the other deposits. It abounds with Helices and other land-shells, but no 

 Mammalian remains were found in it. 



If, now, the road which winds up the hill-side towards Gebel-ta- 

 Ben-Giorgio, be traversed, the observer will pass from the Globi- 



DECADE HI.— VOL. VIII. ^NO. VIII. 23 



