X 
Giilg’ong, on the lel't l)ank of the Tall)i’ag'ar I?iver, ami about a mile southerly 
from Meruthera Old Station, the road passes over a deeoui])Osed (juartz-felsitc', 
showing' well-marked fluxion structure, and probably a dcvitritied rhyolite. 
Prom here to Coekahntta Mountain, which lies aljout hvc miles to the east, the 
predominant rocks are massive greyish-wdiite gritty sandstones, current- 
bedded and pebbly, and ferruginous conglomerates. These rocks appear to 
form part of a conformable series, which, for reasons to be ])reseutly adduced, 
may l)e regarded as of Ilawkesbury (Triassic) age. Cockabutta Mountain is 
formed of these rocks. Thick-bedded sandstones in the upper part of this 
series constitute a well-marked horizon, extending uninterruptedly from 
Cockabutta Mountain to the Pish Beds, and forming the higher portions of 
the surrounding flat-top])cd hills. These sandstones weather into hollow 
turret-shaped masses, as shown in the accompanying photograph. 
Traced to a point alxjut three miles soutli-east of Cockabutta Mountain 
the sandstones are seen to ]iass upwards into a l)ed of hard red ferruginous 
shale, about a foot in thickness, containing numerous impressions of fossil 
])lants. Amongst these the following havel)ecn identihed l)y Mr. S. Dun, 
Assistant Pahnontologist : — 
Tecniopteris 
Alethopterls australis, IMorris. 
Thimifeldia odontopi croides , Morris. 
Thi)wfeldia, sp. 
Tliyllopterls Felstmauteli, Eth. fil. ? 
Sphenoptej'is, sp. 
Detached leaves referable to Baiera or an allied plant most probably. 
One of the most characteristic fossils in this bed is a ])lant referred to 
Tienlopteris? with a “goffered” margin, such as may be often seen in the young 
fronds of living ferns like the hart’s-tongue, Ac. This peculiarity w'as not 
observed bv us in the fronds of T. Balntreei obtained from the Pish Beds. 
As no trace of the venation was preserved in the s])ecimens from the cornier 
locality, it is of course possible that the fossils may yet ])rove to belong to 
some species other than Taaiiopteris Balntreei. 
This bed caj)s a low flat-tojiped hill, so that no evidence was obtainal)le 
as to the nature of the strata which once overlay it, l)ut from the fact of 
there being a gradual transition at its base into the underlying sandstone, 
taken in conjunction with its lithological character, whieli is of a type 
common in the shale beds of the lower portion of the llawkcsl)ury Series, 
