48 E. 0. Teale: 



able development of secondary lawsonite, principally in clear to- 

 cloudy minute radiating crystals. 



No. 118. — Diabase from Upper Lick Hole Creek, one and a-half 

 miles N.N.W. of The Governor. 



A diabase in which albitization is a marked feature, resulting 

 in the formation of clear secondary platy crystals, and raditaing 

 lath-shaped crystals. Ihe augite is mainly converted to secondary 

 hornblende, some of which is normal, while some is fibrous, pleo- 

 chroic actinolite. A good deal of calcite occurs, but neither quartz, 

 nor lawsonite have been recognised. 



No. 119. — Diabase from same locality as No. 118. A coarse- 

 grained type, w4th cloudy felspars, pale augite, partly replaced 

 by hornblende, and a little quartz. 



No. 121. — Diabase from Lick Hole Creek, quarter mile west of 

 No. 118. A rock similar to No. 119, but with an abundance of 

 large opaque crystals of magnetite or ilmenite. 



No. 122. — Diabase from same locality as No. 121. A rock almost 

 identical in characters with No. 118. 



(c) Platy and Splintery Diabase. 



Some forms of platy diabase appear to be due to a special 

 development of jointing in the diabase. This form was favoured 

 by the natives for making their stone axes, and several small 

 quarries occur close to the road, about half a mile north of the old 

 road terminus. More often they appear to represent altered tuff' 

 beds. Rocks of this nature occur at intervals throughout the area, 

 but the outcrops are not readily traced. The most characteristic 

 and tuff like occur on Lick Hole Creek, about a mile above Mal- 

 colm's Creek. Here they are somewhat banded, and suggest stratifi- 

 cation. The rock is dark green, and of very fine texture in hand 

 specimens, and under the microscope (section 24) shows a very fine 

 textured fragmental structure of minute angular fragments in a 

 matrix Avhich cannot be resolved. Section 23 is a basic platy rock 

 with, coarse and fine banding, but is altered, and in parts serpen- 

 tinized so that its original character is not recognisable, but the 

 probability is that it represents a tuff. The splintery diabase is 

 a fine-grained green variety, which splits readily into long slender 

 splinters, or pencils Avith angular edges. It is found in contact w^tb 

 massive diabase at the north-western extremity, of the small diabase- 

 area, a little less than a mile in a straight line south of Fry's.- 



