136 C. A. SUSSMILCH. 
ence of shallow-water conditions of deposition in the form 
of ripple-marks, worn-hburrows, and current bedding. Near 
the base of these strata, a bed of shale occurs about 12 
feet thick, and literally crowded with fossil brachiopods, 
including Spirifer disjuncta, Rhynconella pleurodon and 
Chonetes. Good outcrops may be seen in Gap Creek 
(portion 276, Parish of Barton) and in Coffee Hill Oreek 
(portion 233, Parish of Bowan). Some 80 feet above the 
Spirifer bed is a thin bed of impure limestone, composed 
largely of the remains of asmall brachiopod, Lingula gre- 
garia. This species was first obtained by Rev. J. M. Curran 
and the writer, in Devonian rocks about 5 miles from Cano- 
windra, where it occurs associated with Lepidodendron.’ 
Specimens have since been obtained from the Devonian 
strata at Mount Lambie. Lingula gregaria would thus seem 
to have a fairly wide distribution in New South Wales 
Devonian rocks, and will probably prove useful in correlat- 
ing strata of similar age from other localities in New South 
Wales. The best outcrop of the Lingula limestone is in Gap 
Creek (portion 276); another outcrop is in an unnamed 
creek on portion 277, where it contains also Rhynconella 
and Favosites (a small branching variety). 
Quartzites and Sandstones.—These beds occupy the centre 
of the synclinal fold, into which the Devonian strata have 
have been bent, and are well exposed in Gap Creek. The 
beds of quartzite are very massive and many exhibit ripple- 
marking. The only fossil found was an impression of what 
appeared to be one of the plates of a placo-ganoid fish ; 
unfortunately it was too imperfect for determination. 
Relation of the Devonian to the Silurian Strata.—The 
best junction found occurs in Gap Creek (portion 98). At 
this point the dip of the basal Devonian bed is H. 10° S. at 
* Rec. Austr. Mus., Vol. tv., part iii., “‘ Lingula associated with Lepido- 
dendron,” by R. Etheridge, Junr. 
