Sedimentary Rocks. 61' 



The first sedimentary rocks exposed upstream are Grits, strik- 

 ing N.40°W., and dipping to the east. Then comes a series of 

 muddy grey shales, soft and decomposed, a,nd as far as we can 

 ascertain, unfossiliferous. These are succeeded by a bluff of 

 west-dipping sandstone with thin shale bands. The strike of 

 these rocks is almost due north. Below the bluff, the section 

 is not as clear as one could wish, but a coarse Grit band seems 

 to run up into the hill to the north. Associated with it are rubbly 

 brown shales or mudstones, such as are characteristic of the 

 Grit series elsewhere, and grey mudstones with pellets of gravel, 

 seemingly derived from the coarse band. In the brown shales 

 we find Diplograptus, and from the mudstone we obtained a 

 single small gasteropod. The bed of the creek is littered with 

 large angular fragments of grit. All these beds dip to the west, 

 and there is a syncline between them and the first Grit men- 

 tioned above. They strike more to the west than the sandstones^ 

 of the bluff. The grit in the bands here is usually coarse. It 

 might be regarded as a light conglomerate, and joints or shear- 

 ing planes have cut pebbles and matrix in a manner suggestive 

 of the Kerrfe Conglomerate on a small scale. Among the debris 

 of landslides from the steep bank of the creek are blocks of 

 Upper Ordovician shale, which yielded a small collection of fairly 

 well preserved graptolites. The band from which they are de- 

 rived is to be found some height up the bank, but its relation to- 

 the shales below is obscured by soil and debris. We obtained — 



Diplograptus, sp. 

 Climacograptus, sp. 

 Dicellograptus elegans, Carruthers. 

 Dicellograptus complanatus, Lapworth. 

 Dicranograptus furcatus, Hall, or D. ziczac, Lapw. 



The rubbly shales cross the creek to the south, where the Grit: 

 bands stand out prominently in the bed of the stream. 



On the downstream side of the alluvial flat we come to con- 

 torted rubbly shales striking at first N.10°W., separated by an 

 unconformity from normal carbonaceous Dicellograptus shales 

 dipping west, and striking N.40°W. A grit band crosses the 

 stream further east, striking nearly north, but a soil covered 

 flat separates it from the graptolite shales. To the north, a small 

 tributary gully seems to expose only grits and Diplograptus 

 shales, the Dicellograptus shales passing under the hill. The 

 strike of the grits as one descends this gully from west to east,. 



