544 Transactions. — Geology. 



Bed 4 corresponds with the grey marls of the Geological 

 Survey and the Cuculicea beds of Haast at Mount Brown. 

 The lower coralline limestone occupies the stratigraphical 

 position of the Oamaru building-stone, and is doubtless the 

 local representative of that horizon. 



The arrangement of the Waipara and Tertiary beds is very 

 well seen near the upper end of Weka Pass, in the line of 

 section from Waikari Flats across to Mount Donald Range. 

 It is shown in fig. 17 below. 



jnv\ 



Section prom Waikari Flats to Mount Donald Range. 



a. Waikari Plat. b. South-east boundary-line of Section 8198. c. Valley 

 opposite viaduct, d. Mount Donald Range. 1. Palaeozoic or Second- 

 ary claystones and sandstones. 2. Glauconitic greensands. 3. Arnuri 

 limestone. 4. Weka Pass Stone. 5. Tertiary beds. 



Weka Pass Stone. — This is generally a hard grey lime- 

 stone, sometimes sandy and flaky, and in places crowded with 

 fucoid-like markings. At the north side of the viaduct, at 

 the upper end of the gorge, it is about 125 ft. thick. An 

 average sample of the rock broken from the whole thickness 

 si lowed the following composition. The analyses of Arnuri 

 limestone, Weka Pass Stone, and Oamaru Stone were made 

 by Dr. Maclaurin, D.Sc, Government Analyst : — 



* Oamaru Stone from Totara Quarry, near Oamaru. 

 f Weka Pass Stone from Waikari. end of Weka Pass, from cliffs 

 on north side of stream, a few chains above the railway viaduct. 



