294 OKOLO(;V and PKXIiOUJdV ok TIIK IIREAT SERPENTIXK llELT OF N.S.W. 



fera bisiilcala, ,Spirifera sp. iiidet., Spin'feri>iu iiisculjilti, Vielu.-nnu auccuhoti var. 

 hastata, two indefinite species of Pelecypoch, Conularia sp. '?, PhilUiJsia sp. ?. 



The lower limit of the Burindi })eds is not definiti'. hut we may assume their 

 thickness to be not less than twcnty-tivf hundred feet, and the lower portion, con- 

 taining marine fossils, to be about half that amount, which agrees with the esti- 

 mate of their thickness in the type locality (1, p. 508) . The upper moiety of 

 the Burindi Series does not make any marked outcrop, but seems to consist of 

 mudstone and also of very easily <lecomposed basic tuffs, yielding a tenacious 

 red soil. At the base of these a stronger band of tuff was found to contain hspi- 

 dodendron veltheimianum. Scattered through the belt of red soil are irregular 

 nodular masses of silica, sometimes apparently chalcedonic, at other times clearly 

 silicified tuffs, more often replacements of some unknown material. This horizon 

 of silicification runs throughout the region mapped, and is immediately ff)llowed 

 by rather more felsitic tuft's. 



Above tliis there is a zone of passage into the more keratophyric tuft's wliich 

 form the base of the Kuttung Series. This zone is developed along the eastern 

 slopes of Mts. Cobla and Sugarloaf, and here Mr. Donaldson found the silicified 

 plant remains described in the jialaeontological section of this paper, and consist- 

 ing of gymnospermous wood and a bundle of roots, both of an indeterminate 

 nature. 



Lower Portion of the Kuttung Series. 



In the region mapped the distinction between the base of the Ivuttmig Series 

 and the top of the Burindi Beds is not sharp. The former are less readily de- 

 composed and contain one or more marked pel)bly zones. This basal portion of 

 the Kuttung Series may be traced along the scarp of the easternmost line of the 

 westerly inclined dip-slopes of the Peel Range, which line of ridges is made up of 

 a nearly continuous band of more or less glassy hypersthene andesite about five 

 hundred feet in tluekness. The relation of this to the adjacent Kuttung rocks 

 is not clear, for distinctive outcrops bave not been discovered (but see p. 304). 

 The Kuttung Kocks are here mostly of medium grain, gritty tuft's composed 

 chiefly of acid felspar, and are associated with occasional zones of thinly bedded 

 olive-green mudstone; and of pebbles wliich are apparently waterworn. No 

 glacial striae have been found on any of these yet, but they have not been closely 

 investigated. In Turi Creek (Portions 57 and 59) a thin flow of basalt occui's. 

 Through this portion of the series there extends another series of stratiform 

 masses of more or less gkssy audesite. Duri Peak, for example, is a magnificent 



Text-fig.y. Duri Park tioiii the east. 



