lite LH'olo(ji/ of C(Hinu idai. 189 



Numerous otlier examples occur in the district, but the above- 

 mentioned are the best. Speaking in general, wherever the 

 contact between the Silurian and the glacial beds can be seen, th(^ 

 former is scored and grooved in a manner that could only have 

 been done in our opinion by a glacier or land ice-sheet moving 

 from S.W. to N.E. 



In several instances the direction of ice-flow is more easterly 

 than this general course. In one case, in the valley of the 

 Pyrete Creek, the scorings are about 75^ E. of N. In another 

 case, a scored surface occurring on the W. side of the Lerderderg. 

 just outside the limit of our map, the direction is E. 10° N. 

 We think it probable that the ice in the Coimaidai district 

 travelled in a slightly more easterly direction than that in the 

 Bacchus INIarsh and Myrniong areas, owing to a certain local 

 feature. 



On looking at the accompanying map it will be seen that a 

 little to the N. of Coimaidai, Silurian rocks outcrop in an E. 

 and W. direction almost right across our area. At the time of 

 glaciation this must have formed an escarpment or well marked 

 ridge running transversely to the ice-flow, and probably causing 

 a local deflection to the eastward. 



Thickness and position of the Coimaidai series. The thickness 

 of the glacial beds along the Goodman's Creek, shown in section 

 along the line A B C of the accompanying map, is about 230 feet. 

 Certain beds, however, outcrop on the Lerderderg River a short 

 distance to the west of the mouth of Goodman's Creek, which 

 probably lie aboye the ones shown in section, but owing to the 

 manner in which the dip is masked by alluvium, we ai-e unable 

 as yet to prove the continuity of the beds and to determine 

 their thickness. In any case we are inclined to regard the 

 thickness given by us in our Brisbane paper as excessive. 



jSTow, as the estimated thickness of the beds on the Korku - 

 perrimul Creek is about 2000 feet, it is evident that we have only 

 a portion of the series represented in the Coimaidai district, and 

 it becomes a point of interest and importance to ascertain to what 

 horizons in the larger section ours are to be relegated. AVe are, 

 however, as yet unable to do this with any exactness. 



The tripartite division of the glacial beds as indicated in our 

 flrst paper on this district, is, as shown bv Professor David, :i 



