Sedimentary Rocks. 67 



small waterfall is reached. The lower four or five feet are Grit. 

 Above lie impersistent layers of shale, and then the main mass 

 of the Conglomerate. The Grit at the junction is penetrated by 

 quartz veins, one of which in the base of the Conglomerate shows 

 slickensides, the direction of movement being almost vertical. 

 The shales on the hillside to the west yielded numerous speci- 

 mens of poorly preserved Diplograpti, and similar fossils are 

 found lower down the gully. The strike of the Grits and their 

 relation to the shales at this locality could not be determined. 

 Still further west, Grits appear at the creek level, while, higher 

 on the slopes is the Conglomerate. A gully to the west shows 

 thick bedded shales or mudstones forming, as it were, a pave- 

 ment in the creek. 



(v.) Sandy Creek Road. 



On the Sandy Creek Road, near Allot. 76, a small cutting 

 shows quartzose Grits, overlying Dicellograptus shales not quite 

 conformably. 



(vi.) Western Kororoit Creek. 



South of the Grit outcrop at Watson's Creek on the Mount 

 Alexander Road are other Grit outcrops — on the Eastern 

 Kororoit Creek, north-west of Mount Aitken, north of the West- 

 ern Kororoit Creek (Allots. XXVI.-XXVIII.) and along the 

 same creek near where the parishes of Buttlejork, Yangardook 

 and Holden meet. 



Near the mouth of the small stream from Allot. XIX., Gis- 

 borne, are bluish Dicranograptus shales striking between E. and 

 N.E., a most abnormal strike for this district, and dipping 65°N. 

 North and south of these shales, not seen in contact with them, 

 but apparently deflected by them, are sandstones with thin shale 

 bands. The strike some 100 yards down stream is N. 20° W., but 

 it changes further north to N. 18°E. The dip is steeply to the 

 east. The sandstones contain brachiopods and the shales, Diplo- 

 graptus and Dicellograptus, though graptolites are rare, and the 

 shales are not such as would be expected to contain graptolites at 

 all. Thick bedded sandstones outcrop further upstream, and 

 along the Buttlejork tributary a vertical Grit band, striking 

 N. 15°W., is succeeded by normal blue-black Dicellograptus 

 shales which, at first vertical, turn and dip east at a high angle. 

 Unless the beds are inverted we have here the only case where 

 Grits appear to underlie Dicellograptus shales. This Grit band 



6a 



