156 T. W. E. DAVID. 



probably from an ice raft, and not to any folding subsequent to 

 the imbedding of the boulder. The peculiar position in which 

 the boulder has come to rest with one of its narrow edges down- 

 wards is also in favour of its having been dropped from some 

 height on to what at the time was a muddy sea-floor. Mr. R. D. 

 Oldham has already pointed out (op. cit.) that the close association 

 of large unbroken fronds of such delicate fossils as the Fenestellidce 

 with the boulders at Branxton precludes the possibility of the 

 boulders having been carried to their present resting place by 

 ocean currents; for some of these boulders weigh many tons, and 

 an ocean current strong enough to move such huge blocks would 

 obviously twist and tear the fronds of the Fenestellidce. The 

 latter, however, show every evidence of having been deposited in 

 tranquil water, as they are in an exquisite state of preservation 

 and so numerous as to constitute what might be termed a polyzoal 

 shale horizon. 



Last January Mr. W. G. Woolnough, b.Sc, Demonstrator in 

 Geology at the University of Sydney, made the important dis- 

 covery of a beautifully facetted and glacially striated pebble in a 

 railway cutting west of Branxton Railway Station, at thirty-four 

 miles seventy-two chains from Newcastle. This pebble is figured 

 on Plate 4, fig. 1. 



The opinions therefore of Mr. C. S. Wilkinson and Mr. R. D. 

 Oldham as to there being undoubted evidence of glacial action in 

 these beds has now therefore received important confirmation. 



Recent discovery at Lochinvar. — A few days after the discovery 

 by Mr. Woolnough, I was engaged in making a geological section 

 near Lochinvar, in company with Mr. Oliver Trickett and Mr. E. C. 

 Andrews, b.a. of the Geological Survey, and Mr. W. G. Woolnough, 

 and we discovered at one and the same time what appears to be 

 the base of the Permo-Carboniferous system, and an important 

 glacial horizon. The best outcrop of these beds is about seventy 

 chains north-east of the bridge at the township of Lochinvar. 

 The strata containing the glacial boulders are about three hundred 



