GEOLOGY OF TASMANIA. 69 



Gleichenia dubia (M'Coy) 



Glossopteris moribunda (R. M. Johnston) 



Maorotaeniopieris Wianaraattae ( Feiston) 



Neuropteris antipoda (R. M. Johnston) 



„ Tasnianiensis „ 



Odontopteris crispata ,, 



Peoopteris Buftoni ,, 



„ caudata ,, 



„ odontopteroides (Morris) 



Rhacophyllum coriaceum (Ti. M. Johnston) 



Sagenopteris Tasmanica (Feiston) 



Sphenopteris Morrisiana (M'Coy) 



Sagenopteris salisburioides — 



Sphenopteris alata (Brongt) 



,, elongate (Carruthers) 



,, Tasmanica (R. M. Johnston) 



Strzeleckia ganj^aniopteroides „ 



„ tenuifblia ,, 



Taeniopteris morrisiana „ 



,, tasmanica ,, 



Thinnf'eidia buftoni ,, 



,j feistmanteHi ,, 



,. obtusifolia ,, 



„ media (T. VVoods) 



,, polymorj)ha (R. M. Johnston) * 



„ superba ,, 



,, trilobita ,, 



Trichomanides ettingshauseni „ 



,, spinifoHum (T. Woods) 



Equisetaceae. 



Annularia australis ... (Morris) 



Cycadaceae. 



Podozamites distans? (Prese) 



Pterophyllum diibium (R. M. Johnston) 



„ risdonensis ,, 



„ strahani „ 



Sphenoza mites teistmantelii „ 



Ptilophyllum oligoneurum (T. Woods) 



Co)iiferae. 



Baiera tenuifblia (R. M. Johnston) 



Ginkgophylhim austraHs 



?» 



Salisburia hobartensis ,, 



Zeugophy Kites (poa-cordaites) elon- 



gatus „ 



The sandstones are extensively broken by. intrusions of dia 

 base, or dolerite, which cut up the coal measure areas into 

 different basins. Dykes of diabase traverse the beds. 

 This rock, called dolerite in England and diabase on the 

 Continent, is a holocrystalline mixture of augite, labradorite, 

 felspar, and titaniferous iron ore, or magnetite. Its effusive 

 equivalent is basalt; gabbro forms its plutonic roots. It 

 appears to have been a subterranean intrusion of molten 



