108 



E. 0. Teale: 



map therefort; accoinpaiiying this paper is in many places only a 

 very rough approximation. Most attention was given to the lower 

 portion of the Boggy Creek, and tlie slopes and gullies of the Tara 

 Ra<ng|e. 



General Geology. 



The following formations are included within the area, and will 

 be dealt with in turn: — 



1. Upper Ordovician, consisting • chiefly of highly inclined 



quartzitic sandstones and slates, the latter chertified 

 in parts. 



2. " Snowy River Porphyry Series " — probablv Lower Devo- 



nian in age, and consisting of volcanic rocks, both- 

 effusive and pyroclastic, ranging from andesites to acid 

 lavas. 



3. Middle Devonian, comprisi'ng crj^stalline limestone and 



calcareous shales. 



4. Kainozoic, ranging from Lower Kainozoic to Pleistocene. 

 Observations were confined mainly to the first two series. 

 Upper Ordovician. — This Series consists chiefly of alternating 



thin beds of quartzitic sandstones, mudstone, shale, phyllite and 

 some clierty slate. There is a marked absence of tlie black grapto- 

 lite slates, which are so characteristic a feature of the Ordovician 

 rocks in the Wood's Point and Wellington districts. 



Fossils are rare, and frequently imperfectly preserved, but all 

 the recognisable forms have been Upper Ordovician graptolites. 



The first record is due to 0. A. L. Whitelaw, who obtained 

 graptolites in a road cutting at 5 miles 50 chains from Nowa Nowa, 

 in the Buchan Road. These were examined by the late Dr. T. S. 

 Hall (30), and the forms identified are tabulated in the list given 

 elsewhere. (Table 1.) Three additional occurrences found by my- 

 self are marked on the map. 



LOWER DtVONI/^N , _^^ '^ UPPER ORDOVICIAN 



Chlon/ic and sericific porphyro'ids Chloritlc shdles,skles^dn(J (j/idrlii/u^ssnc/stones 



NW 



sc 



section e 

 Boggy Creek Nowa Nowa 



Scale. 



