G8 
V.--GKOLOGICAL RANGE AND GFAiGRAFllICAL 
DISTRIRUTION 
So far as we have been able to ascertain, Eurydesma has l)een found 
in Tasmania, New South Wales, Queensland, and the Salt Hange of India. 
The Tasmanian species, E. cordatum and E. hohartense^ occur 
principally at Maria Island and Porter’s Hill, and in the Eurydesma zone 
near Eeaconslleld. It is considered that these localities belong in the main 
to an horizon which mav he correlated with the Lower Marine Series of New 
South lYales. It is certain that the Maria Island, Beaconsfield, and a 
great portion, at any rate, of the Porter’s Ilill Series belong to the Lower 
Marines, so that Eurydesma may he regarded as essentially characteristic of 
that period in Tasmania.^ 
In New South Wales, Eurydesma is known from many localities in 
the Hunter Kiver Permo-Carboniferous Basin, and in almost all instances 
from the Lower Marines — Harper’s Hill, Allandale, Ravensfield, Pokolhin, 
and Grass Tree Hill, and in northerly extensions at Kempsey, AParhro and 
Willi AVilli on the Hastings River, Koree, near M’^auchope, the head of the 
Clarence River, near Rivertree. 
The occurrence of Eurydesma. in the Upper Marines has Iteen recorded 
several times, hut only in one case have we been able to corroborate it. In 
1905 Mr. C. A. Sussmilch" collected sjiecimens of Eurydesma liobartense 
from near Belford, in the railway section from beds mapped by Professor 
’r. M". Edgeworth DavkP as of Upper Marine age. This evidence must 
he accepted at present, as no faults of sufficient magnitude to admit of 
Lower Marine beds being brought to the surface at that locality have 
been found. It may be pointed out that the assemblage of fossils occurring 
in these Eurydesma, beds is not directly comparable with those of the 
adjoining undoubted Upper Marines. 
‘ Johnston — Syst. Acc. Geol. Tas., pp. 119, 124, 126 ; Id. — Trans. R. Soc. Tas. for 1886 [1887], p. 6. 
* Sussmilch — Proc. Linn. Soc. N. S. Wales, 1906, XXXI, Ft. I, p. 175. 
• David — Mem. Geol. Survey N. S. Wales, Geol. No. 4, 1907, map. 
