^88 N. R. Junner: 



Near the Thomson River copper mine the beds dip easterly, 

 ^t angles between SO.o and 70o, and strike N. 15o E. to N. 20° 

 E. ; and the general stratigraphical succession, from the west to 

 «ast, starting from a point about half a mile west of the Thomson 

 River, is as follows : — 



(1) Normal shallow water marine sediments chiefly shales and 

 sandstones. 



(2) A band of conglomerate and gritty beds, well seen in sec- 

 tions on the track from the Copper Mine township to the Jubilee 

 Mine, and also in cuttings near the limestone quarries in Cooper's 

 •Creek. 



(3) Overlying these conglomerates and fossiliferous grits in the 

 Cooper's Creek section, occurs a lenticular mass of dense black 

 limestone, highly fossiliferous, and traversed by veins of calcite. 

 The limestone matrix weathers more rapidly than the fossils, and 

 as a result the latter are often seen in fine relief on the weathered 

 surface of the rock. The forms present are chiefly corals, crinoids, 

 brachiopods, and polyzoa, and they are very similar to the fossils 

 ■occurring in the Yeringian limestone at Lilydale. Bedding is not 

 very evident in the massive limestone, but occasional shale bands 

 •serve to define it. This band of limestone is not present in the 

 flection along the road from the Copper Mine township to the 

 Jubilee Mine. The corresponding strata, in this section, overlying 

 the conglomerate, consist of grits and calcareous shaly beds, and 

 one or two narrow bands of black, lioneycombed chert, which 

 undoubtedly replaces fossiliferous gi'itty beds. 



4. Another outcrop of similar black limestone occurs not far 

 east of the above mentioned beds. At the time of my visit to the 

 locality, it was being cjuarried immediately to the north of Cooper's 

 creek, near its junction with the Thomson river. This patch of 

 limestone does not extend far to the soutli, for sections on the 

 same line of strike at the Thompson River show that the massive 

 limestono is absent, and that its place is taken by calcareous, fos- 

 siliferous grits containing pebbles of quartzite, and limestone 

 nodules composed in some cases almost entirely of corals. No 

 igneous pebbles were seen by the wiiter in this conglomerate. 



Pebbles of igneous rocks are very numerous in the first men- 

 tioned conglomerate. The majority of these pebbles are well- 

 rounded, and they are generally small, being rarely more than 

 three inches in diameter, although Mr. Herman mentions that 

 pebbles up to 6 inches or 8 inches in diameter, are occasionally 

 present. They are partly set in a fine brownish coloured, granular 



