y&wj geol

1. Hatton’s Corner Reserve set aside in 1927 after lobbying by A.J. Shearsby. The top layer consists almost entirely of late Silurian tabulate coral. The lower layer of shale contains tabulate and rugose coral with crinoids and brachiopods. Site visits require permission from NSW Parks and Wildlife.

2. Rare bryozoan Pesnastylus resembling a fern, deposited in late Silurian marine shale underlying Devonian tuff beds.

3. Cast of moulted pygidium of Dalmanites trilobite and intact specimen showing legs and tail, in late Silurian siltstone.

4. Scree from the Silverdale limestone of the late Silurian, showing graptolites and a gastropod of unknown species.

5. Traffic in Sydney bound lane of the Hume Highway pass tuffaceous conglomerate flanking the rhyolite pipe of Bowning Hill. This early Devonian tuff appears to have been welded by the adjoining and therefore later igneous intrusion.

6. Sill of dacite intruding into fossiliferous Silurian siltstone on a cliff on the Yass River. The streaked appearance is due to layers of white kaolin and grey-green chlorite.

7. Anticline enclosing a cave in early Devonian Taemas limestone seen from the floodplain of the Murrumbidgee River. This feature is known locally as ‘The Shark’s Mouth’.