86 MR. L. M. PARSONS ON THE CARBONIFEROTJS [vol. Ixxiii, 



111 expressing my thanks to those geologists who have rendered 

 me assistance, I must record my indebtedness to the late Dr. Arthm* 

 Yaughan, who examined my collection,, identified several sjDecimens, 

 and encouraged me by helpful criticism and suggestions. Some 

 months ago he urged me to publish my results at once, but un- 

 fortunately I was unable to do so, as I had not then examined all 

 of the ex])osures in Calke Park. I have great pleasure in acknow- 

 ledging the continual encouragement and valuable advice received 

 from Prof. W. W. Watts, whose kind help has enabled me to give 

 more serious attention to the examination of the Melbourne area 

 than it was possible for me to do during the years 1912 and 1913. 



I am grateful for criticism and advice received from Prof. C. Gr. 

 Culhs and Dr. A. Morley Da vies. To Mr. E. Wood, of Melbourne, 

 I am indebted, not only for the use of his unique collection, but 

 also for help and comjmn ion ship in the field. Several photographs 

 illustrating this paper are the work of Mr. G. S. Sweeting, and I 

 have received considerable help in the peti-ological ^vork from 

 Mr. E. J. Tallin. To both of these gentlemen I offer my sincere 

 thanks. 



II. General Description op the Area. 



The district being small and possessing i-elatively simple struc- 

 tural features, little need be said under this heading. The general 

 succession of rocks dealt with is the following : — 



(3) MiUstone Grit. 



(2) Shales. 



(1) Carboniferous Limestone. 



A])art from the outcrop of pre-Cambrian rocks in the neigh- 

 hourhood of the village of Thringstone, the oldest foi-mation 

 exposed in the area defined above is the Carboniferous Limestone, 

 whicli crops out in tAvo well-defined series of inliers — a western 

 sei-ies and an eastern series. The area is bounded by unconform- 

 able Permian and Trias on the north, and in other directions mainly 

 by two pre-Triassic favilts. One of these, known as the Thringstone 

 Fault, extends from Charnwood in a north-westerly direction to- 

 Avards Repton and brings the Coal Measures down on the south ; 

 the other, which we may call the Breedon Fault, passes north- west- 

 Avards from Charnwood, and then sAviiigs northwards skirting 

 Barrow Hill, Breedon Cloud, Breedon-on-the-Hill, and King's 

 Newton towards the Trent at Swarkestone. The throw of the 

 Breedon Fault is probably considerable, as a boring through the 

 Trias near Tonge village reaches (Virboniferous Limestone after 

 jiassing through nearly 300 feet of Keu])er and about 9 feet of 

 what is probably Millstone Grit. Tlie Millstone Grit inside the 

 area is variable in thickness, the Geological Survey estimating that 

 it varies between 200 and 300 feet. Wherever the junction ot 

 Millstone Grit with the Shales below is seen, there is a conformable 

 sequence. The lower beds of the former are always conglomeratic, 

 but the higher portion consists of fine yellowish-white grit, Avhich 



