Fig. 92—CARBOPERMIAN BIVALVES.
A—Stutchburia farleyensis, Eth. fil. Carbopermian. N.S. Wales
B—Deltopecten limaeformis, Morris sp. Carbopermian. N.S. Wales
C—Aviculopecten sprenti, Johnston. Carbopermian. N.S. Wales
D—Chaenomya etheridgei, de Kon. Carbopermian. N.S. Wales
E—Pachydomus globosus J. de C. Sow. Carbopermian. N.S. Wales
Carbopermian Bivalves.—
One of the most prolific palaeozoic series for bivalved mollusca is the Carbopermian. To select from the numerous genera and species we may mention Stutchburia farleyensis ([Fig. 92 A]) and Edmondia nobilissima from Farley, New South Wales; and Deltopecten limaeformis ([Fig. 92 B]), found in the Lower Marine Series at Ravensfield, New South Wales, and in the Upper Marine Series at Burragorang and Pokolbin in the same State, in Queensland at the Mount Britton Gold-field, and in Maria Id., Tasmania. Deltopecten fittoni occurs in both series in New South Wales, and in the Upper Marine Series associated with “Tasmanite shale” in Tasmania. Aviculopecten squamuliferus is a handsome species found alike in Tasmania and New South Wales; whilst A. tenuicollis is common to W. Australia and New South Wales. Other characteristic bivalves of the Carbopermian of New South Wales are Chaenomya etheridgei ([Fig. 92 D]) and Pachydomus globosus ([Fig. 92 E]). The gigantic Eurydesma cordatum is especially characteristic of the New South Wales Lower Marine Series, and is also found in Tasmania. All three species are found in Queensland.
Triassic Bivalves.—
The Triassic rocks of New South Wales were accumulated under either terrestrial, lacustrine, or brackish (estuarine) conditions. Hence the only bivalved mollusca found are referred to the freshwater genera Unio (U. dunstani) and Unionella (U. bowralensis and U. carnei ([Fig. 93 A])). The latter genus differs from Unio in the structure of the adductor muscle-impressions.
Fig. 93—LOWER MESOZOIC BIVALVES.
