756 GEOLOGY OF THE NORTH-WEST COAST OF TASMANIA, 



exposed a small mass of flat-bedded breccia containing fragments 

 of fossil wood. A little west, of Lodder's Point the ancient rocks 

 are hidden for about three-quarters of a mile by an overflow of 

 basalt, and then continue with occasional interruptions to Pen- 

 guin Creek. For the last two miles or thereabouts the schists 

 and altered sandstones are so much folded, jointed, and contorted,, 

 and so interspersed with massive bands of conglomerate and 

 breccia that their mutual relations are not easily discoverable. 

 The conglomerate, or some of it, is certainly interbedded, but a 

 band of rather fine-grained breccia appears to lie unconformably 

 on the other rocks of the series. Strings of iron pyrites, and 

 galena, with some copper pyrites, and stains of blue and green 

 carbonates, occur here and there in the schists. There is a narrow 

 belt of, probably, post-Tertiary drift between the beach, and the 

 rising ground to the south which is mostly occupied by basalt. 

 Still farther south are massive deposits of red and brown haema- 

 tite, and a small band of bright specular iron was noticed a little 

 to the west of Penguin Creek. Here the old rocks rise in rugged 

 ridges, with a general northerly strike, until they disappear west- 

 erly under the basalt, which extends to and behind the sandy 

 beach of Preservation Bay, and also shows itself between out- 

 crops of the old rocks near Sulphur Creek, and the small sandy 

 beaches farther west. The next mile is occupied by grey and 

 dark-coloured slates and grits, with interbedded bands of con- 

 glomerate, all highly inclined, striking about N.N.E., and rising" 

 steeply to the south. The coast-line from the River Blythe to 

 Wivenhoe is bounded by lofty rugged ridges showing on the sea- 

 ward face grey grits, conglomerates, slates, sandstones intersected 

 by veins of white quartz, and strong bands of quartzite, which 

 continue with little intermission to the River Emu, where the 

 entrance is protected on the east by masses of intensely hard 

 brecciated conglomerate. On both banks of the Blythe, and at 

 Wivenhoe, are drift gravels and sands reaching to a height of 

 not less than 30 feet above high-water mark. 



From near the Blythe, south of Heybridge, some promising 

 specimens of red haematite and copper pyrites have been obtained. 



