1124 The Geology of Central Australia.  [November, 
forms: Monotis, M. curta; Mytilus minimus, M. ingens, n, s. 
(Tenison-Woods); Tancredia; Cytherea; Zima gigantea; Car- 
dinia listeri; Pleurotomaria; Cucullæa oblonga; Avicula; Pec- 
ten; and Modiola. In the gypsiferous marlites are found many 
calcified Belemnites, B. canaliculatus and B. densus, but no other 
fossils, as far as I was able to ascertain. 
The beds are generally horizontal, but in some places are 
slightly inclined. The inclined strata give rise to the low table- 
top hills mentioned above. About a hundred miles west of the 
Peake range there is a range of rough flat-topped hills trending 
north. These consist of eruptive felsite breaking through the 
Jurassic strata, partially metamorphosing and folding them, but 
only in the immediate vicinity of the eruption. The felsite is fine 
granular in texture, and varies in color from white to red. | 
A section taken near the outbreak of felsite shows the rocks ia 
the following order, beginning at the surface: æ. Sandstone con- 
glomerate, cross laminated in many places; 2. Gypsiferous mate 
lite, containing Belemnites ; c. Compact gray fossiliferous lime : 
stone; d. Compact ferruginous sandstone. This order of super- 
position is the same wherever I have seen the Jurassic beds ri 
the interior. A cross section of the Peake range is as seen 
Fig. 3. 
Fic. 3.—A, Archean schists; ¥, Jurassic beds; 7, springs. o 
: l iven above. 
The sequence of the Jurassic beds is the same as e at 
At the Finiss springs these beds lie uncomformably sagt 
the Paleozoic rocks as seen in Fig. 4. | 
SIE eee et a ee EN 
Fic. 4.——C, Cambrian; ¥, Jurassic; +, springs: . M 
The beds do not vary lithologically, but the fossils afer | 
absent. They seem to be distributed in patches. me 
sandstone in every natural section that I have seen 1$ the ! ae 
bed. Well borings, however, have shown that similar roc™” : 
