244 PROCEEDINGS OP SECTION C. 



described and figured* by Mr. Wilfred Hudleston, and included 

 the following : — 



Natica, sp. indet. 



Myacites australis, Hudleston. 



Cytherea Woodwardiana, Hudleston. 



Cyprina, sp. indet. 



Modiola linguloides, Htidleston. 



Gervilleia angusta, Hudleston. 



Avicula orbicularis, Hudleston. 



Dr. Woodward has also described and figuredf some Mesozoic 

 plant remains, taken from specimens collected by me from the 

 quartzite and sandstone beds apparently of the same age as the 

 porcelanized sandstone and jasper I'ock of the table-hills, although 

 it lies at a higher elevation, and rests on the primary rock of the 

 main range, which borders the plains southwards of Lake Blanche. 



Sand-hills and ridges cover a large portion of the Mesozoic 

 country. They extend in long ridges with accompanying mounds 

 in. more or less parallel lines, in patches, isolated hills and ridges, 

 and undulating plains for miles across country, covering up the 

 surface. The sand is usually brick red above, and grey and yellow 

 below, and very fine grained. The fine red sand constituting the 

 upper portions of the ridges is loose and shows no sign of strati- 

 fication ; but the grey semi-consolidated sand and sandy-clay at 

 the base shows a roughly horizontal stratification. 



Along the sand-hill country between Innamincka and Haddon 

 Station, there are isolated red and yellow sandhills and ridges at 

 some distance from the main body. The same can be noticed on 

 the Cooper and Diamentina at intervals along the courses of the 

 river flats. The prevailing strike or bearing of these ridges in the 

 northern poi'tions of the territory, which they cover, is about 

 north-north-west and north-west, while southward and to the east 

 of the Flinders Range it is noi'th-north-east and north east. 



In crossing the country from the eastern boundary to the 

 Diamentina, sand hill country is met with at intervals the whole 

 distance, sometimes the ridges are close together, at other times 

 separated by spaces of stony desert, or plain, a mile or more in 

 width, but always keeping a general parallel course. They rest 

 indiscriminately on the clay flats and plains, or the stony downs, 

 their elevation above these varying from ten to seventy or eighty 

 feet, and width from one hundred to two hundred yards at the 

 base. There is no evidence of the sand having been blown 

 along the surface or transported from a distance by water flowing 

 over the surface of the ground, which is as a rule, quite clear of 

 sand between the hills, I am of opinion that in many cases, 

 particularly in those of the isolated ridges and mounds traversing 



* Geol. Mag. 1884, 1, p. 339, t. 11. 

 t Geol. Mag. 1885, II. p. 289, t. 7. 



