GEOLOGICAL RECONNAISSANCE OF THE STIKLING RANGES. 9 1 



The great hog-backed ridge of Mondurup is built up chiefly 

 of quartzite which is strongly ripple marked and false 

 bedded. There has been very considerable disturbance of 

 strati lication in this area, and one reading of the inclination 

 of the current laminae about half way up the slope gave a 

 dip of 42° to the south east. The strong probability is that 

 this- does not represent, in amount at all events, the angle 

 of repose of the unconsolidated sediment. 



The Cranbrook road traverses the extreme northern foot- 

 hills of the range for the greater part of its length, and 

 consequently runs chiefly over the sediments of the range 

 or their products of weathering. At four and a half miles 

 from Oranbrook, however, the sedimentary series is left, 

 and thenceforth the road passes over eruptive rocks. The 

 nature of the junction at this point was not determined by 

 me, but probably this locality would yield valuable inform- 

 ation as a result of careful investigation* 



From Tenterden for a distance of five and a half miles 

 due east along the Lunt Road, plentiful exposures of normal 

 granites and greenstones are encountered. The contact of 

 these with the sedimentary rocks of the range is very 

 clearly defined in the immediate neighbourhood of the Slate 

 Quarry on Loc. 2772. At the time of my visit the country 

 had been swept clean by an immense bush fire, so that a 

 very satisfactory section was exposed. The actual contact 

 is at a point an eighth of a mile west of the quarry. It is 

 sharply defined and trends north 33° west. At the im- 

 mediate point of contact the granite is intensely acid, and 

 passes into the slates in the form of vein-quartz loaded 

 with partially to almost completely digested and assimilated 

 fragments of jasper. The contact is a transgressive one. 

 As above mentioned, to the west of the slate quarry, slates 

 are in juxtaposition with the plutonic rock, further to the 

 south-east quartzites stand in a similar relationship, and 



