298 w. j. c. ross. 



the fossils in those beds is likely to be found. The present list 

 from Limekilns only includes Rhynchonella pleurodon, Chonetes, 

 near to C. Hardrensis ; and a plant remain hardly sufficiently 

 definite to name. From Glanmire we have in addition Spirifer 

 disjunctus, a rugose coral, possibly a Zaphrentis, Lepidodendron 

 australe, and another plant impression having the appearance of 

 a stem of a Calamite or Phyllotheca, certainly not a Lepidodendron, 

 but again not distinct enough to be identified definitely. Careful 

 search and description of the fossils will probably add considerably 

 to this rather meagre list. 



Summary. 



The Limekilns area is principally interesting geologically from 

 the fine exposures of Silurian Limestone, rich in fossils, which 

 occur there. What are believed to be Silurian rocks cover an 

 immense area around Bathurst, but they are for the most part 

 completely barren of fossils, so that for the determination of their 

 age one would have to depend on their similarity of character to 

 beds in other parts of the Colony, at all times an unsatisfactory 

 kind of evidence, were it not for the existence of occasional beds 

 of limestone. Many of these, however, have undergone so much 

 alteration that they are useless to the palaeontologist. The Lime- 

 kilns beds, being removed from the area of extreme metamorphism, 

 have retained their fossils in a very satisfactory state of preserva- 

 tion and are therefore valuable. Four distinct outcrops of lime- 

 stone occur, which may be numbered 1, 2, 3, and 4, as on the map. 

 Whether these are all separately formed beds is uncertain at 

 present. Yery possibly there may be one or more faults, as, for 

 instance, between 2 and 3, and there is little doubt that there 

 has been a good deal of disturbance of the beds, with fracturing 

 in places. The strike of the beds remains tolerably regular, but 

 the dip, where obtainable, appears to vary a good deal, both in 

 direction and amount. In this the limestones agree with the 

 Silurian slates, which at several places in the same area show 

 fracture and contortion. 



