-62 Harris and Crawford : 



varies from north-east to north, and the Diplograptus shales be- 

 low them strike N. 20°W. The dip throughout this section is 

 westerly, and the hill* between the gully and the main creek shows 

 nothing but grit, which seems to pass right over the Dicellograp- 

 tus shales outcropping in the bed of Jackson's Creek. 



This represents the most complete section, though it is incom- 

 plete at critical points. South of the main creek a steep " wash 

 out " descends to Watson's Creek. The uppermost beds, below 

 basalt, are arenaceous shales, apparently bent in a syncline. Be- 

 low are grit, sandstones, and rubbly shales or mudstones, all ap- 

 parently conformable, striking N. 10°\V., and dipping west. Below 

 the lowest grit band Diplograptus and ( ?) Dicranograptus fur- 

 catus were obtained, but are very rare. In Watson's Creek, to 

 the southward, are rubbly Diplograptus shales, striking N. 10°E., 

 and dipping west, succeeded after an interval, by a grit band 

 which strikes N. 10°W., and, if continued north, would pass 

 through the " washout." Two or three hundred yards to the 

 south-west, just past a north and south fence, Dicellograptus 

 shales outcrop, striking N. 10°E., and dipping west, while still 

 further upstream, decomposed shales, apparently of the Grit 

 series, dip East, and strike N. 20°W. Grit boulders litter the 

 "hill slopes to the south-west. The Dicellograptus shales last 

 mentioned are almost certainly identical with those on the bank 

 of Jackson's Creek to the north, the graptolites of which are 

 given in the list on pages 64, 65. Not only are the graptolites iden- 

 tical, but the colour^ texture and lamination of both beds are 

 identical and distinctive, not resembling those of any other 

 locality with which we are acquainted. This is of importance 

 in attempting a correlation of the rocks of the area. 



We have dealt with this area in fair detail, because it repre- 

 sents perhaps the most intimate association of Grits and normal 

 Upper Ordovician. 



Our interpretation of the features we have described is only 

 provisional. We sum up our observations as follows : — 



1. Grits and rubbly Diplograptus shales are of the same series 

 -and are interstratified. 



2. The " wash out " section indicates — 



(a) A syncline in the Grits. 



(b) Dicranograptus in associated shales. 



We at first thought that there was evidence of an unconformity 

 between the Grits and these shales, but further investigation leads 



