152 GEOLOGY OF THE GLENDONBROOK DISTRICT, 



south-westerly, and the Permo-Carboniferous rocks strike 100° 

 dipping" southerly. 



(i.) Lower Marine Series. — In portions 35 and 98, Parish of 

 Tangorin, just opposite portion 81, there is a small outcrop of 

 rather coarse sandstone containing remains of plant-stems. This is 

 resting unconformably on Carboniferous conglomerates, and is the 

 lowest member of the Permo-Carboniferous System found in the 

 district. The outcrop, however, is only of limited extent, being cut 

 off by the Webber's Creek fault to the west, and thinning out be- 

 tween the Carboniferous conglomerates, and the overlying mud- 

 stones towards the south-east. From its lithological character, and 

 from the presence in it of plant-stems, and also since it is the 

 lowest member of the Lower Marine Series developed here, it seems 

 very probable that it is to be correlated with the sandstone which 

 is immediately above the glacial beds in the Lochinvar District. It 

 attains a thickness of about 100 to 150 feet. 



Next above this sandstone, there is a thickness of some 300 feet 

 of bluish shaly mudstones. These can be traced, almost continu- 

 ously, nearly right round the basin. About half-way up in these 

 mudstones, there is an horizon of hard limestone-concretions con- 

 taining fossils. These are chiefly V enestella{%) sp., and a small 

 brachiopod shell (? Dielasrna) . This bed with Fenestellidae can be 

 seen at three localities in the Parish of Stanhope, namely, (1) on 

 the W.-E. road in portion 66, (2) in portion 46, and (3) in the 

 creek in portion 50. The mudstones are fossiliferous, but most of 

 the fossils appear to be hi the upper part, i.e., above the limestone- 

 concretion horizon. Some of the fossils from these mudstones 

 are : — 



Spirifer duodecimcostata. Aviculopecten tenuicollis. 



S. tasmaniensis. A. englehardti. 



S. stokesi. Pachydomus. 



Martiniopsis subradiata. Ptycomphalina trifilata. 



Chcenomya sp. Hyolithes Icmceolatus. 



The best locality for collecting these, is in portion 10, Parish of 

 Stanhope, on the western slope of the hill, between the creek and 

 the eastern boundary of the portion. 



