Ordovician Rocks at Daylesford. 175 



An appearance of ripple marks has been before noticed as 

 occurring at Italian Hill. Ripple marking is also seen at Bald 

 Hills Creek in the sandstone, and at Jim Crow Creek, below 

 Spring Creek, in a series of slates in which faulting parallel to 

 the beds has occurred on three different beds. 



" Ripple marks " have been frequently noticed in the Ordo- 

 vician Rocks of Victoria. 



I find only one mention of ripple marks on the Quarter-sheets, 

 near Metcalfe (13 S.E.) "nearly vertical contorted raudstone and 

 shales, some of the beds are ripple marked." Oblique lamination 

 and cross-grained sandstone (to be referred to below) are also 

 noticed near here. 



Ripple marks are described by Mr. Dunn as common at 

 Bendigo at many localities, and horizons, and regarded as true 

 ripple marks.^ 



Mr. T. S. Hall, however, referring to similar occurrences at 

 Castlemaine, suggests that there and at Bendigo they are the 

 result of crumpling during folding. 



Mr. C. C. Britt.lebank'- says of the rocks at the Werribee Gorge, 

 "contortion and pseudo-ripple markings are well developed, the 

 latter appear more extensively in localities which have been sub- 

 jected to the greatest strain and pressure." 



Mr. G. W. Lamplugh, writing of crush conglomerates in the 

 Isle of Man, says: — "Where packing has taken place, the lines 

 of stratification are confused in a series of wrinkles, which emerge 

 on the bedding planes, as small parallel folds closely resembling 

 ripple marks ;" to these he applies the term pseudo-ripple 

 marking.^ 



Mr. E. R. Faribault, of the Geological Survey of Canada, 

 describing saddle reefs in Nova Scotia, where, however, the 

 folding has not proceeded nearly so far as at Bendigo, states, 

 " the corrugations and crumplings are more pronounced in the 

 slate and quartz, and owe their origin to the sliding of thick 

 beds of quartzite over one another, between which the softer 

 bands curve and buckle in a wonderful manner."^ 



1 Report on Bendigo Goldfleld, No. ii., 1896. 



2 Vic. Naturalist, vol. xviii. 



3 Q.J.G.S., li. 



4 Austr. Mining Standard, Oct. 29, 1899. 



