136 



GEOLOGY MAITLAXD-HRANXTON DISTRICT, 



they approach to within a few feet of the top seam of the Greta 

 Coal- Measures. The following is a list of the fossils from this 

 substage : — 



Zaphrent is robusta. 

 Palcmster clarkei. 

 Protoretepora amp! a . 

 FenestettaCl )fossula. 

 Dielasma inversa. 

 D. biundata, 

 D. hastata. 

 Spirifer convoluta. 

 S. vespertilio. 

 S. avicula. 

 S. tasmaniensis. 

 S. duodecimcostata. 

 S. strzeleckii. 

 Martiniopsis oviformis 

 M. subradiata. 



var. transversa. 



var. morrisii. 

 Productus brachythcerus. 



Strophalos la jukesi. 

 (Jhanomya etheridgei. 



C. undata. 



A viculopecten englehardt i, 



A. ponderosus. 



A. tenuicol/is. 



A sp. 



Deltopecten farleyensis. 



D. leniusculus. 

 D. sp. (juv.). 

 8emiiiula(\). 

 Mceouia carinata. 

 M. valida. 

 Stutchburia costata. 

 Astartila polita. 

 Leptodomus duplicicosta. 

 Plaiyschisma oculus. 

 Goniatites micromphalus. 



The upper half of the Branxton Stage is composed of sand- 

 stones and calcareous mudstones, with frequent shaly bands. 

 They contain numerous glacial erratics, which sometimes attain 

 a very large size, some of them being over two tons in weight. 

 These beds are exceedingly rich in marine fossils, perhaps the 

 most abundant being members of the Fenestellidae(?). In them, 

 at about 2,300 feet from the base of the Branxton Stage, occurs 

 a limestone-horizon which contains numerous well-preserved 

 Foraminifera.* This upper part is also characterised by an 

 abundance of Trachypora wilkinsoni, which is only found 

 sparingly on any other horizon of the Upper Marine, and is 

 extremely scarce in the Lower Marine. Good outcrops of the 



* Chapman and Howchin, "Monograph of the Foraminifera of the 

 Permo-Carboniferous limestones of N. 8. Wales." Mem. Geol. Surv. N. S. 

 Wales, Pal., No. 14, 1905. 



