Sedimentary Rocks. 63 



us to alter our opinion. The gap between Grits and Dicrano- 

 graptus shales seems to be due solely to superficial debris. 



3. This syncline is also indicated in Jackson's Creek, and by 

 the occurrence of similar Dicranograptiis-Dicellograptiis shales 

 on either side of the Grits. 



4. Grits occur further east, but their relation to those already 

 mentioned is not shown. They also cover the hill in the north 

 •of Jackson's Creek. 



Our conclusions are: — 



1. The Grit series here is in all probability Upper Ordovician. 



2. It overlies Dicranograptus shales. 



3. There is no evidence of normal U(pper Ordovician grapto- 

 lite shales overlying the Grits. 



(ii.) Lancefield Junction. 



The Grits outcrop on the western slopes of Jackson's 

 Creek, south of Lancefield Junction, and compose the 

 hills as far south as Evans Creek, but were not found 

 immediately south of that stream. These hills are excep- 

 tionally barren, comparing unfavourably even with Lower Ordo- 

 vician and Kerrie Conglomerate. This locality will be dealt with 

 in two parts — (a) the section exposed in the creek, and (b) the 

 hills south of the creek. 



(a) Jackson's Creek, south of Lancefield Junction. — As Jack- 

 son's Creek comes from the west immediately before turning 

 .south at Lancefield Junction, Grit ridges appear on the right 

 bank, and, if continued north, should cross the stream. Directly 

 in the line of strike of these ridges, a low cliff forms the south 

 bank of the creek, and, viewed from the far side of the stream, 

 seems to be normal Upper Ordovician shales with a sandstone bar 

 about the middle of the section, and it is so shown on QS. 6SE. 

 The bank is almost vertical, and there is a deep pool at its foot. A 

 false step may mean an undesired bath. Working from the west 

 along this section we cross Diplograptus-Climacograptus shales 

 ■dipping east and broken by faults. The sandstone band is typi- 

 cal- Grit. Some feet wide at the top of the bank it rapidly nar- 

 rows, and is less than a foot wide at water level, and probably 

 does not extend much further. It is followed by vertical or west- 

 dipping shales, which gradually turn over to the east. These 

 shales yielded Diplograptus, Climacograptus and Glossograptus, 

 .and the main Grits overlie them. On top of brown shales comes 



