75 



range (The Bunkers), which has a south-south-easterly direc- 

 tion from the ''Big Hill" of Erengunda Creek to the locality 

 under examination. 



Having reached the base of the high range, the eastern 

 side of the range was found to form a dip slope of the 

 Archaeocyathinae limestones, from top to bottom, but the 

 fossils are not very well preserved. The dip of the beds, at 

 the bottom of the range, reads E. at 48°. The limestone 

 beds have a rolling curt^iture along the strike which, at times, 

 causes angles in the outcrops, with slightly varying directions 

 of dip. I was informed by Mr. Napier that the range has 

 a steep slope on its western side and is followed by a high 

 range of hard quartzite rock, similar to that which accom- 

 panies the Archaeocyathinae beds at Wirrealpa Hill, at the 

 "Big Hill," on the Erengunda Creek, and elsewhere. These 

 quartzites, with their interbedded shales, form the true 

 ''Bunkers." 



In a small creek, on the eastern side of the range, there 

 is a thin bed of laminated limestone that is extremely con- 

 torted, making acute v-shaped folds, with a dip S.W. at 45°. 

 This bed is similar to^ the perpendicular and contorted thin 

 limestone met with, in about the same stratigraphical posi- 

 tion, at the old Wirrealpa station. A quartzite overlies the 

 limestone (as it does at the old station), then follow rotten 

 purple slates, extending over a distance of half a mile, between 

 the base of the range and the Balcoracana Creek, 



At the southern side of the Balcoracana Creek, facing 

 the main range, is a high hill showing a scarp face to the 

 valley. The beds, seen in section, consist of thick, soft, and 

 red-coloured sandstones, interbedded with purple and other 

 coloured, thin-bedded, argillaceous beds, which cross the creek 

 near the east and west bend of the stream. 



Resting on the dip-slope of the last-named red sandstones 

 and shales is the bed corresponding to the Five-mile Ridge 

 limestone, which, at a distance of a few yards, is followed 

 by the oolitic and Oholella limestone (see Section). At the 

 immediate junction of the north-easterly tributary (mentioned 

 above) with the main creek, a fine and complete section of 

 these limestones occurs in the creeks, with a dip E. 10° N.. 

 at 45°. The fossiliferous limestone is sometimes flaggy and 

 nodular in structure. The bed is rich in Oholella and other 

 Brachiopods (in some cases the interior of the shells is filled 

 with rhombohedral crystals of calcite), Pteropods, and 

 abundant fragments of Trilobites, but none were seen suffi- 

 ciently complete to permit of further determination. The 

 fossiliferous zone, so far as a few minutes' examination could 

 determine, was limited to a few inches in thickness. 



