Graptolite Beds at Ddylesford. 277 



the road and railway cuttings. Where it would be expected in 

 Smith's Creek I found no break in the easterly dips. The strike 

 of locality 22 would pass close to or east of this anticline. The 

 anticline is broadly curved. 



25. — East of this aJiticline in the road cutting east of the rail- 

 way. Didymograptus bifidus,t. Phyllogxaptus typus,t, Tetra- 

 graptus serra.t, T. bryonf)ides,t, T. quadribra.chiatus,t, Clono- 

 graptus or Dendrograptus sp,t, Uastleinainian, Wattle Gully 

 Beds,t. 



From the locality 11 to the head of the expo-sed Ordovician in 

 Smith's Creek is a distance at right angles to the strike of about 

 three-quarters of a mile. From the syncline between 14 and 15 

 to the anticline at 19, there is a prepondea-ance of westerly dips 

 to the extent of about 1200 feet, and some of the short stretches 

 of easterly dip have a compai'atively flat dip for some part of 

 their length. There may be in all 1000 feet in thickness of beds 

 exposed, the lowest of which are Bendigonian and the highest 

 Wattle Gully. 



Between 11 and 14 there is not room for the whole of this 

 series to be repeated in the distance of about eight or nine 

 chains, yet the beds at 11 appear to be at least as old as those 

 at 19. Similarly between the South Cornish shaft and the anti- 

 cline at the railway crossing there is only a distance of about 

 three or four chains, yet beds appear which are of the Wattle 

 Gully series and probably not far removed in age from the 

 beds at 14 and 15. 



The most probable explanation seems to be that there is 

 unobserved faulting at both these places, with an upward move- 

 ment on the west side, so that some beds are cut out of the 

 surface section. As these would probably be reversed faults, 

 their direction would be similar to those on which the Cornish 

 and the Ajax reefs are situated. 



If such faults recur at other parts of the district, they would 

 counteract a preponderance of westerly dips, as they actually do 

 in this section, and would therefore tend to reconcile the state- 

 ments of Hunter and Krause as to prevalent dips, with the evi- 

 dence of the fossils. 



An attempt was made to trace the folds of the Smith's Creek 

 section in the railway cuttings and other exposures to the south. 



