26 PEOF. T. W. E. DAVID & ME. E. F. PITTMAN [Feb. 1 899, 



(2) The occurrence of two very similar beds of limestone, con- 

 taining the same species of fossils, at Moor Creek and in the parish 

 of Woolomol. As these two outcrops of what appears to be the 

 same bed of limestone are now about 3 miles apart, and there is no 

 evidence of the existence of a fold between them, the most reason- 

 able explanation of the severance of these outcrops is that it has 

 resulted from faulting. 



(3) The fact that the radiolarian limestones, and also the black 

 cherts above the garnetiferous limestone at the eastern end of the 

 section, appear to be repeated in that part of the section which lies 

 west of the coral-limestone at Tamworth Common, would seem to 

 require the existence of a fault for its explanation. 



(4) The fact that hitherto Lepidodendron australe has never been 

 observed in beds stratigraphically as low as the horizon of the 

 Burdekin Limestones (Middle Devonian), to which the Tamworth 

 limestone probably belongs; and the fact that, unless the existence 

 of this fault be admitted, it must follow that the Lepidodendron aus- 

 trale between D and E, and also at E (PI. Ill ), and that between 

 F and G are stratigraphically far below the horizon of the Tamworth 

 coral-limestone. 



If, however, our interpretation of the section be correct, the 

 original horizon of the Lejndodendi^on australe-heds was above, and 

 not below that of the coral-limestone. 



Black chert is developed in the Tamworth Common section 

 between Nos. 1 & 4 radiolarian limestone-beds : it merges above 

 and below into cherty shales. A chemical analysis of this chert 

 is tabulated on p. 32 (No. 1234). Although, as seen under the 

 microscope, it appears to contain a number of minute carbonaceous 

 streaks, the chemical analysis shows only ' minute traces ' of 

 organic matter, and a specimen of cherty shale taken from an 

 adjoining spot yielded only -86 per cent, of organic matter. 



The radiolarian tests can be distinguished readily on the brown 

 crust, a result of weathering, which coats the radiolarian limestone ; 

 and, on etching out the lime from unweathered portions of the 

 limestone, the original siliceous tests of the radiolaria are exposed 

 to view, frequently in a good state of preservation, especially as 

 regards the medullary test. 



The rest of the section westward does not call for special com- 

 ment, being formed of typical radiolarian clay stones and cherty 

 shales, with three beds of radiolarian limestone. 



All these beds are a repetition, according to our view, of the 

 strata described at the eastern end of the section. The total 

 number of lenticular beds of radiolarian limestone observed by us 

 east of the great fault amounts to eighteen, and it is probable,, 

 as the limestones are thin and lenticular, and the section some- 

 what rubbled over in places, that several beds have escaped our 

 observation. 



