BY A. B. WALKOM. 115 



fessor David's work was published ; but since then, a good deal of 

 prospecting has been done along this part of the outcrop, and fresh 

 information was obtainable, and is included in this paper. 



To make the lists of fossils as complete as possible, fairly large 

 collections were made, and these have been supplemented by 

 records of localities of fossils, from the publications of the Geo- 

 logical Survey of New South Wales, and from the "Catalogue of 

 Australian Fossils," by R. Etheridge, Jr. In many cases, however, 

 the record of the locality of fossils is not definite enough to per- 

 mit of their horizon being determined. Only cases where the 

 locality is sufficiently definitely stated, have been used in complet- 

 ing these lists. The map which accompanies the paper (Plate ix.) 

 is part of Professor David's Map of the Hunter River Coal- 

 Measures, published by the Geological Survey of New South 

 Wales, in 1907, with additions which have resulted from my field- 

 work. 



Lower Marine Series. 



The development of the Lower Marine Series varies considerably 

 in different parts of the district; vertical sections have been 

 obtained in three places, and are shown in Figs. 1-3. In Fig. 1 

 (p. 116), which gives the most typical section, and that in which 

 the series is most completely represented, the series attains a thick- 

 ness of nearly 4,800 feet. This section is taken from the occur- 

 rences in the area between Farley, Greta, and Cessnock. Fig. 2 

 (p. 117) gives the succession near the Carboniferous inlier of Mt. 

 Bright, where there is a considerable overlap of the lower beds. Fig. 

 3 (p. 118) is taken along the Eelah Road, where there is also a con- 

 siderable overlap. 



The group of hills about one mile south-east of Lochinvar Town- 

 ship, of which Winder's Hill is the most prominent, is composed of 

 a varied series of rocks of Carboniferous age. They include a 

 variety of volcanic rocks, both acid and intermediate; and also 

 sedimentary rocks, such as conglomerate, sandstone, and yellow- 

 ish cherty tuff. These sedimentary rocks, in places, contain abun- 

 dant plant-remains, such as Rhacopteris, which indicate that they 

 are of Upper Carboniferous age. 



