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As forms strongly resembling these also occur im situ in the 

 gritty sandstones of the Queen River, and also in a similar for- 

 mation on the Corinna Track north of Long Plain, where they 

 were obtained by Mr. James Smith, it is very probable that the 

 fossiliferous portions of the conglomerates were derived from 

 such rocks, and hence we are safe in referring them to a 

 higher position, as in the present classification. This conclu- 

 sion is to some extent borne out by Mr. T. Stephens, who has 

 expressed an opinion that certain boulders contained in the 

 conglomerates have even been " derived from rocks which are 

 not older than the Lower Carboniferous or Devonian period." 

 This must be a matter for future observation to settle. In 

 the meantime I assign them a position in the Upper Silurian 

 rocks between the Queen Eiver group and the soft slates of 

 Eldon Valley and Pingal. The latter formations have been 

 deemed by Mr. Gould to be more recent than any other 

 member of the Upper Silurian observed by him in Tasmania. 



Eldon Valley Clay-slates and Mudstones. — In the 

 Eldon valley Mr. Gould describes the occurrence of clay-slates 

 and mudstones, containing fossil remains of undermined 

 species of the following genera, viz. : — 



Calymene. 



Orthis. 



Cardiola, d'c. 

 The rocks of this group are to lie found in a section 

 described by the same observer between North Eldon Eiver 

 and the eastern extremity of Camp Hill. On either hand the 

 metamorphic schists rise from under them towards the Rivers 

 Murchison and Alma respectively, and evidently the latter 

 have been formed in a deep syneline of the older 

 metamorphic schists. Mudstones similiar in character 

 to the Eldon beds are also described by Mr. Gould 

 as cropping out near the mouth of the Gordon, where 

 they are supposed to bo succeeded by certain soft- 

 clay slates at Head Quarters Island, which, on lithological 

 grounds, Mr. Gould deemed to be the equivalents of 

 those at Fingal. It is unfortunate that the fossils obtained 

 by Mr. Gould are not now available as guides to local 

 workers. The difficulties of access to this part of the country 

 prevent us from obtaining more precise information, regarding 

 the stratigraphy and other matters of interest. It is shown, 

 however, that in certain high peaks overlying the Eldon beds 

 isolated bosses of greenstone appear whose bases are obscured 

 by Upper Palaeozoic marine mudstones and still more recent 

 sandstones, among which, under peaks farther to the east 

 (Coal Hill), beds of coal of supposed Mesozoioage are known 

 to occur. It is apparent that denudation has removed the 



