sequence of strata from the top of the upper coal seams to the top of the 
llawkeshuiy Series. Lithological evidence shows that there is a break between 
the Narraheen beds and the Estheria beds. On ihc whole, the latter seem 
lithologically more related to the underlying Coal-Measures than to the 
llawkeshury beds.” 
AVith th(' view of fully illustrating the sparsely scattci'ed Invertebrate 
remains found in this consecutive series of deposits, the Estheria beds are 
])rovisioually included here. 
The meagreness of this fauna renders the occurrence of any animal 
remains, however small, or poorly preserved, of the higlu^st importance, 
whether it he regardcal as throwing light upoii the age of the rocks in 
question, or their mode of deposition. 
In the fourth edition of the late llev. AV. E. Clarke’s Sedhuentarn 
Formations of New South JFates, published in 1878, the fossils of the 
Ilawdveshury-AVianamatta Series mentioned, consisted wholly of plants and 
lish. The first published addition to this list w^as Dr. J. C. Cox’s announce- 
ment of the discovery of Estheria in the Aloore Park and Port Hacking 
bores. To this little fossil Hr. Cox gave the name of Estheria Cofjhtanif 
after Air. John Coghlan, of the Australian Diamond Drill Company, under 
w hose directions the Alooro Park Bore w'as sunk ; hut Dr. Cox did not publish 
a description of it. The Estheria. was first met with at a depth of 1,523 feet, 
in dark shaly partings, in a hard 30-foot sandstone, and occurred at intervals 
as low as the bore was })rosecutcd, extending through a thickness of 337 feet. 
It is quite clear from these measurements that E. Coghtani is here Avholly 
conlined to Air. David’s Estlieria-shale. In the Port Hacking bore Estheria. 
Avas not found. Dr. Cox says, until a depth of 2,100 feet had been attained, 
hut “in exactly the same cliaracter of shaly rock.” 
In the bore-cores at Dent’s Creek Estheria Avas discovered l>y Air. 
T. N. E. David, at a depth of 1,362, and again at 1,625 feet, in dark, sandy 
clay shales. The fossil AA^as again observed in a siliceous clay shale at 1,651 
feet. These horizons are, respectively, 860 and 003 feet, and 577 feet above 
the highest coal struck in the hore.^ At the still greater depths of 1,932 feet 
and 2,000 feet respectively, valves of a larger form Avere found. Up to the 
year 1882, therefore, Avhen Air. C. S. AAulkinson’s “Notes on the Geology 
of Noav South AAAles”t appeared, Estheria Avas the only Invertebrate fossil 
discovered in this great thickness of beds. 
First edition, p. 54, 4to., Sydney (Department of Mines), 1882. 
