SEDIMENTARY ROCKS OF THE LOWER SHOALHAVEN RIVER, 321 
point of yielding when the folding force ceased. This force 
seems to have come from the south-east. 
_ Another series of fossiliferous strata of Devonian age 
were found on the Shoalhaven River, about three miles 
west of Yalwal Creek. They consist of quartzites dipping 
to the S.W. at an angle of 60°. As inthe Httrema beds, 
there are a number of fossiliferous horizons, the maximum 
being about three feet in thickness. They are completely 
composed of the remains of shells, which however are 
wretchedly preserved. The rock consists of a quartzose 
limestone, which is very hard and tough so that it breaks 
completely across any fossils it may contain. Fossils can 
only be obtained in the completely weathered material, and 
these are very poor. They are remarkable for the pre- 
valence of gasteropods, Bellerophon, EKuomphalus ? Nati- 
copsis? and Mourlonia? were the genera found. Of the 
pelecypods Goniophora? and Ctenodonta? were the only 
ones found. Spiriferdisjuncta and Rhynconella pleurodon 
were here found in situ. 
Devonian Inlier near Grassy Gully.—Though not seen 
in situ, there seems reasonable evidence that an inlier of 
Devonian rocks should exist somewhere between Grassy 
Gully and Yalwal Creek. On one of the previous excursions 
a boulder was found lying in a gully on the northern side 
of Grassy Gully. This was found above the junction of the 
Devonian rhyolite and the Upper Marine sandstone, and 
contained numerous specimens of Spirifer disjuncta and 
Rhynconella pleurodon. This seemed to suggest an out- 
erop of Devonian higher up. The gully was subsequently 
explored further up and the face of the mountain partially 
examined. Numerous hard quartzite boulders up to two 
feet in diameter were found, but no actual outcrop was 
seen. But as the country is very rough and the outcrops 
largely hidden by talus slopes, such an outcrop might easily 
U—Dee. 2, 1908. 
