BY G. D. OSBORNE. 165 



The marine fossils recorded from Hilldale (late Greenhills) are given in 

 the following list, prepared from Professor Benson's Census and Index to the 

 Burindi Fauna (Benson, 1921) : 



Zaphrentis sp. indet. Syringothyris lexsuperans 



Lophophyllum corniculum Aetinoconchus planosulcatus 



Actinoerinus sp. indet. Athyris ef. expansa 



Perieohocrinus sp. indet. sp. indet. 



F^nestellm sp. indet. Leptodomus duplieostata 



Leptaena (StropJiomena) Nuculana sp. indet. 



rhomhoid-oMs var. analoga Aviculopecten sp. indet. 



Orthotetes cremstria Entolium sp. indet. 



Prod'uctus scabriculus Gosseletina austrcdis 



muricatus Yvania koninckii 



(f) sub quadratics Bellerophon sp. indet. 



sp. indet. Bucama sp. indet. 



Orthds '{BMpidomella) australis Euomphalus sp. indet. 



resupinata Naticopsis, n.sp. 



Bielasma sacculum var. hastata Loxonema rugifera 



Spirifera lata Orthoceras sp. indet. 



ef. ovalis Griffithides sp. 



sp. indet. PhilUpsia diingogensis 



To this list must be added the following sis forms, collected by the writer 

 at Hilldale, which have not hitherto been recorded from that locality, although 

 they have all been found elsewhere in the Burindi rocks of New South Wales. 

 The determinations of all the author's specimens were kindly made by Mr. W. 

 S. Dun. 



Cladochonus tenmcolUs (?) Betzia ulotrix 



Productus pustulosus Bellerophon Mulcus 



Reticulata crebristriata Murchisonia sp. 



The fine and coarse tuffs (iv.) and (vi.) appear to differ only in gi-ainsize 

 and not in composition, although no thin sections have been prepared. In hand- 

 specimens they are seen to be composed of felsitic fragments, pieces of jasper 

 and occasional grains of quartz. The remaining tuffs call for no special remark, 

 except for, the mention that they may locally become very calcareous and grade 

 into fine-grained limestones. 



Near Wallaroo Hill, portion 152, Parish of Ufangton, tuffs of Burindi age 

 containing fossil remains axe well developed, the fossils being poorly preserved. 

 To the south-east of this locality a thin band of felsite occurs among-st the 

 marine rocks. 



About two and a half miles to the east of Mt. Gilmore there is an area of 

 marine rocks, trending north across the Limeburner's Road between the mile- 

 pegs on that road distant from Clarencetown four and five miles respectively. 



In this area the chief rocks are tuffs, always acid, hard grey cherts, silicified 

 ( ?) mudstones and a lava flow about 20 feet thick, which is exposed in Portion 

 56, Parish of Wilmot, but which can not be traced vexy far along the strike. 

 This type proves, under the microscope, to be an andesitic pitchstone which 

 has experienced a certain amount of devitrification, the porphyritie constituents 

 being a little plagioclase, hypersthene, biotite and hornblende (?). This is un- 

 doubtedly the equivalent of a similar rock occurring in the Burindi rocks near 

 where the road to Wallarobba leaves the Clareneetown-Dungog road. The oc- 

 currence of this flow to the east of Mt. Gilmore, in a stratigraphical position 



