GEOLOGY OP TASMANIA. 69 



Gleichenia dubia (M'Coy) 



Glossopteris moribunda (R. M. Johnston) 



Macrotueniopteris Wianamattae (Feiston) 



Neuroptei-is antipoda (R. M.Johnston) 



,, Tasmaniensis „ 



Odontopteris crispata ,, 



Pecopteris Buftoni ,, 



„ caudata ,, 



„ odontopteroides (Morris) 



Rhacophyllum coriaceum (R.M.Johnston) 



Sagenopteris Tasmanica (Feiston) 



Sphenopteris Morrisiana (M'Coy) 



Sagenopteris salisburioides — 



Sphenopteris alata (Brongt) 



„ elongata (Carruthers) 



„ Tasmanica (R. M. Johnston) 



Strzeleckia gangaraopteroides „ 



„ tenuifolia ,, 



Taeniopteris morrisiana „ 



,, tasmanica ,, 



Thinnf'eldia buftoni ,, 



,, feistmantelii „ 



,. obtusifolia „ 



„ media (T. Woods) 



,, polymorpha (R. M. Johnston) 



„ super ba „ 



,, trilobita ,, 



Trichomanides ettingshauseni ,, 



„ spinifoUum (T. Woods) 



Equisetaceae. 



Annularia australis (Morris) 



Cycadaceae. 



Podozamites distans? (Prese) 



Pterophyllum dubium (R. M. Johnston) 



„ risdonensis ,, 



„ strahani „ 



Sphenoza mites feistmantelii „ 



Ptilophylhim oJigoneurum (T. Woods) 



Coniferae. 



Baiera tenuifolia (R. M. Johnston) 



Ginkgophyllum australis „ 



Salisburia hobartensis ,, 



Zeugophyllites (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 subten-aneau intrusion of molten 



