1194 NOTES ON THE GEOLOGY OF BOWNING, N.S.W., 



Two-mile Creeks in the higher portions of their basins. Ultimately 

 the Two-mile Creek crosses a denuded part of the ridge, and joins 

 the Bowning Creek two miles south of the township. From this 

 until it joins the Yass River, the bed of the Bowning Creek chiefly 

 passes along quartz porphyry, and, notwithstanding the insignifi- 

 cance of the stream and the extreme hardness of the rock, it has, 

 for some miles, worn a passage of considerable depth. 



Climate. — The climate of Bowning may be termed cool. For 

 eight months of the year frosts are common, and usually during 

 each winter light falls of snow take place. Even in winter 

 when the sky is cloudless the days are genial ; but with sunset 

 the temperature rapidly falls in winter and summer alike. In 

 summer the temperature rarely exceeds 100° F. in the shade, and 

 occasionally frosts occur in December. These extremes of 

 temperature are trying to delicate constitutions. 



The average rainfall is about 20 inches per annum. The 

 prevailing winds are westerly. During the month of November 

 they blow west from sun-rise to sun-set, when an east wind 

 succeeds, that is, a sea breeze, which lulls towards midnight. 



In December and January when the Great Plains of the west 

 have been thoroughly heated, it is not unusual for the wind to set 

 eastward for three or four clays continuously. 



The easterly winds bring up the rain-clouds ; but the moisture 

 is not precipitated until their return by the westerly winds, except 

 at rare intervals. 



Distribution of Rocks. — In the eastern division of the area now 

 treated of, and starting from the eastern boundary, is a bed of 

 coralline limestone, a continuation of the same bed concerning 

 which Mr. Jenkins has already given some interesting details in 

 his paper ' On the Geology of Yass Plains.' (1) Next succeeds 

 a stratum of shale with masses of coral distributed through it, 

 then fossiliferous shale, and an impure limestone, the 'trilobite 



(1) Proc. Linn. Soc. N.S.W. Vol. in. pp. 21, 216 ; Vol. iv. p. 404. 



