Fauna and Stratigraphy of the Stormberg Series. 475 



their place of entombment. Although complete skeletons are not 

 common --one articulated skeleton only from the Red Beds is known 

 to the writer the majority of the described forms are known 

 from a number of associated bones, some of which are frequently 

 found still articulated. Isolated bones are rare, and few show signs 

 of rolling or long transportation. At the base of the Beds, remains 

 of several large animals were found together in bluish clay near 

 Kromme Spruit, Herschel apparently swamp-lovers whose remains 

 were washed by moving waters into some quiet swampy spot: a 

 supposition whose probability is increased by the discovery near by 

 of a large silicified log. In general, the bones of an incomplete 

 skeleton of a single animal on-nr together in one spot a fact 

 which would lie difficult of explanation if transportion over a long 

 distance be postulated. 



Cave Sandstone. \Ye have seen that the Cave Sandstone is a 

 massive fine-grained rock of varying thickness with bedding planes 

 but feebly developed, and that in the basal portion only. The rock 

 is generally white or cream-coloured, but often it is pink or red 

 and at its base is sometimes coloured as deeply as the underlying 

 Red Beds. Athoiigh the massive portion of the formation is imbedded 

 it is often traversed by vertical joints. 



The following description by du Toit of a specimen of the Cave 

 Sandstone from Rocky Dell, Maclear, C. P., may be taken as typical 

 of the bulk of the formation, (see Geol. Coinm. Rept. l'.U<). p. 88). 



"The rock is composed of grains from -05 to -08 mm. across of 

 quartz and felspar, the former predominating. They vary in outline 

 from sub-rounded to angular and are sometimes elongated splinters 

 with sharp edges. Some of the quartz grains are quite clear, others 

 contain needles of rutile and dusty inclusions. The felspar consists 

 of orthoclase and plagioclase. either fresh or clouded and kaoli- 



nised; microcline is absent There are flakes of somewhat altered 

 biotite mica, muscovite mica, and a good deal of secondary 

 white mica (sericite) in the felspar, around quartz grains, and some- 

 times within the quartz itself. A characteristic feature of the Cave 

 Sandstone is the presence of grains of zircon and in the slide there 

 are a number of worn crystals of this mineral, together with some 

 colourless garnet, and some grains of rutile. The groundmass of the 

 rock is fairly abundant, cloudy and dusty and probably for the most 

 part kaolin; in places it has a pinkish colour corresponding to the 

 pink mottling of the sandstone in the hand specimen". "Another 

 section from the summit of the lllankonio Mountain, Mount Fletcher, 



