878 



Warren Reservoir. Here an inspection was made of the works- 

 that were in progress and of the interesting contorted rocks 

 exposed in the wall of the excavations. The pipeclay deposits 

 and the rutile mines existing in the neighbourhood were also 

 examined. From these and other sources good collections of 

 specimens were made. 



On July 24, 1915, Morialta Gorge was visited, and under 

 the leadership of Mr. A. G. Edquist a physiographical study 

 of the features of the gorge was made. The two distinct types 

 of scenery which characterize the gorge — the softly-rounded 

 hills at the entrance and covered with a wealth of green turf, 

 and its rugged and almost barren type of scenery that abounds 

 further up the gorge — were pointed out. It was also show^n 

 what a great part the rainfall, dip of strata, jointing and 

 composition of rocks played in the moulding of the scenery. 

 Mr. Edquist explained that the marked change in the flora was 

 due to the nature of the rocky subsoil. Certain communities 

 of plants preferred the clays and loams derived from argillace- 

 ous rocks, others enjoyed the calcareous loams derived from 

 the thick stratum of dolomitic limestone, while a third class 

 flourished on the light sandy soils derived from the quartzites 

 which gave rise to the gorge. At the entrance of the gorge, 

 where the dense quartzite rocks lifted themselves to a height 

 of several hundred feet, the junction of the hard and soft rocks 

 was pointed out, and they marked the position of the original 

 waterfall. 



On August 21, 1915, an excursion was made to Snowdert 

 Beach, near the Outer Harbour, under the leadership of Mr. 

 W. J. Kim_ber. After a good collection of marine mollusca 

 had been gathered from the long strip of narrow beach, Mr. 

 Kimber, by a series of short discourses, mentioned many 

 interesting facts about their habits. The differences between 

 the carnivorous and vegetarian mollusca were explained and 

 the methods of attack used by the univalve shells upon the 

 bivalve shells were demonstrated. A piece of a Ci/praea thersifes 

 was taken, showing that this beautiful cowrie, though not 

 suspected previously, lives in the adjacent waters. Specimens 

 of Pinna inermis, with CajjuJus a u straits and Ostrea anr/asi 

 attached, were also found. 



On September 11, 1915, Mrs. R. S. Rogers lead a walking 

 excursion from Upper Sturt to Belair, with the object of 

 studying the various species of wattles. The display was some- 

 what disappointing, the season being rather advanced. How- 

 ever, this was more than compensated for by the abundance 

 of other flora, notably orchids, of which eleven species were 

 taken. 



