(>4 geolo<;y ov iasmama. 



Tlie horizontal bods of longlomcrato, whiih lie as lieavy 

 caps on the Dial Range an«i most of tho Western Moun- 

 tains, have been assigned to this system. These massive 

 conglomerates crown IMount FarrcU. Mnnhison, Lyell. 

 C)\ven. Jukes, Ixoland, Claiule. A-c. 



■^'(rrno-Cdrhonifttdus. 



These rocks consist of sandst^mes, mudstones, grits, con- 

 glomerates, and' limestones, with shales and thin coal seams. 

 The most productive coal measures in TaLinania do not be- 

 long to this system, but are Upper Me^ozoic, probably 

 Jurassic. The Permo-Carboniferous strata have been 

 thoroughly examined by Mr. R. M. Johnston, and his classi- 

 fication is adopted: — 

 rp2^tr — 



7. EliTolite syenites, phonolites and trachytes, at Port 



Cygnet. 

 6. Southpoi-t, sandstones and shales. 

 5. Mount Cygnet and Adventure Bay, sandstones and 



shales. 

 4. Upper marine nuidstoues overlying Mersey coal ; 



Poi-ter Hill shales and sandstones, Sandy Bay. 

 3. Lower coal measures, Mersey Basin. 

 '2. Tasmanite shales. 

 Lower — 



1. Lower manne mudstones, limestones, conglomerates, 

 and grit-s. throughout S.E., N.E., and Midlands. 

 Conglomerates, grits, and micaceous sandstones and slaty 

 llagstones, in thick beds, form the base of the system. These 

 conglomerates, at One Tree Point, North Bruni, at Darling- 

 ton, the northern point of Maria Island, below the lime- 

 stone beds, contain large blocks of granite, porphyry, ilec. 

 The angular blocks on Maria Island are over a ton in 

 weight, and on Bruni, too, they are very large. The Lower 

 Marine series of limestones and mudstones comprises, in 

 Southern Tasmania: — 



3. Fenestella mudstones. at Porter Hill, The Grange. 



Cascades, etc. 

 '2. Spirifera and strophalosia mudstones, Huon Road, 



i\:c. 

 1 . Limestones, on Mai'ia Island, at Bridgewater ; also 

 at Fingal. Middle Arm, etc.. in the North. They 

 contain favositcs, spirifera, product us, conularia, 

 pdchi/domus, notomya, aviculopecfen, &c. 

 These marine beds occur all along the Derwent, from Bruni 

 Island to New Norfolk. At Porter Hill, south of the Alex- 

 andra Battery, on the Brown's River Road, sections are ex- 

 posed of the lower marine series, with its common fossils^ 



