104 NOTES ON THE DISCOVEKY OF A GANOID FISH. 



matter whether these apparently similar formations are, in 

 reality, members of the same horizon. The evidence of 

 breaks in the series at Knocklofty, and on the Huon Eoad 

 near the Old Toll Bar, also adds perplexity when relationships 

 are sought to be established. And much observation is yet 

 needed before it is possible to satisfactorily determine the 

 true relations of the various separated sandstone formations, 

 lying either between the Upper Paleozoic Mudstones or 

 tipper Carboniferous Coal Measures, and the Coal Measures 

 of Mesozoic Age. 



Section From the Cascades to Knocklofty. 



The series of sandstones and shales between the bed of the 

 creek at the Cascades, and the blow of intrusive greenstones 

 forming a conical knoll above the highest sandstone quarry 

 on Knocklofty, is about 800 feet thick, measuring from the 

 bed of the creek. At this point it is not known to what 

 depth the series extend, but it is probable the thickness 

 altogether will exceed 1,000 feet. 



The following is a description of the series exposed, taken 

 in ascending order : — 



1. Yellow fissile sandstones, splitting up 



into thin evenly bedded flagstones ... 20 



2. Grreyish or blackish micaceous bed of flaggy 



sandstone, with hardened ferruginous ' 

 nodules, sometimes enclosing remains of 

 fossil fish ... ... ... ... ... 5 



3. Friable mottled shales — green, red, or 



yellow — with obscure impressions of 

 minute strap-shaped plants (apparently 

 slightly unconformable with No. 3) ... 60 



4. Thick bedded sandstones — white, red, and 



yellow, worked throughout for building 

 stone with thin bands of fine friable 

 yellow or grey shales intercalated 

 ii'regulary at intervals ... ... ... 715 



Total Thickness 800 



