Pliysiography of the Glenelg River. 



103 



D. — The south-eastern part of the basin, extending towards Port- 

 land; lower land than C, but somewhat diversified; in the north 

 excellent land as at Merino, etc., Avhen the level-bedded Jurassic 

 mudstones occur; further south heavily timbered, but with big areas 

 of "heath country." Open basalt plains cover about one-third 

 of the area, the remainder consisting of level-bedded ferruginous 

 and calcareous marine tertiaries (? pliocene, etc.); a few streams 

 draining west and north-west. 



III.— Rainfall. 



The rainfall of the whole area is good, being a little above the 

 average for the State. As will be seen, the distinctive nature of the 

 topography and drainage in the four areas A, B, C, D, does not 

 appear to be at all due to the rainfall, but rather a product of 

 three factors : (a) elevation, (b) slope, (c) nature of the rocks. Mr. 

 H. A. Hunt, the Commonwealth, meteorologist, has courteously sup- 

 plied the following details of the rainfall, based on 10 years' 

 records. It will te noted that the only appreciable distinction is 

 that the flat plains of area B, stretching from Apsley to Toolondo, 

 suffer to the extent of five inches per annum, the rain-bearing 

 winds having parted with a good deal of their moisture before this 

 area is reached. 



Av. 28.48 



Av. 28.( 



Av 27.16 



