22 AUSTRALASIAN ANTARCTIC EXPEDITION. 



Microscopic Characters. In thin slices under a moderate power of the microscope 

 (2in. obj.) the rock is seen to consist mainly of angular quartz grains intermixed with a 

 few particles of igneous rock, more or less basic, and with occasional twinned and zoned 

 felspars. Brown palagonitic glass showing perlitic structure occurs in the rock, and 

 also numerous crystals of augite. The average diameter of the larger grains is 0-4mm. 

 (Plate XIII., fig. 3). 



Organic Particles. Remains of foraminifera tests are seen ; and one fine cross 

 section of a milioline, of the Miliolina subrotunda type, is present. A fragment of an 

 indeterminate coral appears in the hand specimen, and its examination by means of 

 the micro slide leaves no room for doubt as to its relationship to that group. The 

 coenenchyma is cavernous and traversed by strong pillars, and there is abundant evidence 

 of the " dark-line " structure of a recent coral. It appears to be an arborescent form 

 (Plate XIII., fig. 4). 



An echinoderm plate is seen in section, distinguished by its typical perforate 

 character and calcitic structure. 



Matrix. This consists of a fine detrital dust and minutely crystalline calcareous 

 cement. The larger fragments are generally evenly spaced out in the mass. 



Conclusions. The present specimen is a consolidated beach sand, consisting largely 

 of cleanly broken particles of terrigenous material of the nature of basic and sub-acid 

 igneous rocks, evidently derived from the immediate locality ; these, together with 

 littoral and coral zone organisms, are cemented in a matrix composed of a mixture of 

 fine igneous rock detritus and calcareous deposited material. 



NOTE ON MORAINIC MATERIAL, CAPE DENISON. 

 By P. CHAPMAN, A.L.S. 



Morainic Mud. From Lower Moraines found underneath boulders. About 35ft. 

 above sea level. 



This consists of angular fragments and sand grains derived from hornblende gneiss 

 and schists, with some material, probably from a granitic source. The fine washings 

 contain numerous crystals of micaceous, pyroxeuic, hornblendic, and felspathic minerals. 

 No organic remains were noticed. 



Morainic Detrilw. Sample from Upper Moraines, taken from the ice, about 120ft. 

 above sea level, Commonwealth Bay. 



Coarse and fine detritus of hornblende gneiss and granitic rocks containing pink 

 and white felspars. Fine washings include numerous small crystals of ferro-magnesian 

 silicates and felspars. No organic remains were seen. 



