304 H. I. JENSEN. 
In the eastern branch of the Ettrema one may see a line 
of sandstone cliffs, three hundred feet in thickness, flanking 
the cafion. Under this formation we havea series of highly 
folded and fractured rocks consisting of cherts, quartzites, 
slate, and limestone. This series contains typical Devonian 
fossils (Spirifer disjuncta and Rhynconella plewrodon). 
Some beds of limestone are rich in crinoid stems. On the 
Nelligen to Braidwood road one encounters calcareous 
shales and sandstones containing the same fossils in a better 
preserved condition. Evidently the Devonian rocks have 
undergone much more alteration at the Httrema than thirty 
miles further south at Milo mountain. Yet, even here, 
they have been greatly folded for in Budawong mountain 
one may see the whole series folded into a gigantic anticline 
over 1,500 feet in amplitude. 
The Upper Marine series at Sassafras commence at the 
base with conglomerates. This is particularly well seen on 
the western fall of the tableland. Both in conglomerates 
and in the overlying beds of coarse and fine sandstone there 
frequently occur boulders of great dimensions, some reach- 
ing three feet in diameter. Some of them are rounded and 
some angular, and they consist of various rocks, granite, 
quartz porphyry, slate, basalt, quartzite, etc., some of 
which are not known to occur in situ within a radius of 
fifty miles. Although a few of these boulders exhibit 
scratches there are no striations which can with certainty 
be identified as glacial; yet, from their mode of occurrence, 
I believe that they belong to the glacial horizon of the 
Upper Marine (Branxton horizon). Several beds of very 
fine grained white and very fissile sandstone occur above 
this horizon. They cleave into thin plates, whose surfaces 
are studded with carbonaceous vegetable imprints, too 
poorly preserved for identification. Still higher occur. 
- sandstones which contain Martiniopsis subradiata, Spirif er 
