Jukes on Australia. 
383 
points. At Mr. Hull’s limestone quarries at Tolosa, about four 
miles from Hobarton, I found dark grey limestone, sometimes 
compact, sometimes finely laminated, with fragments of shells and 
corals. The beds of limestone were about two feet thick, and in 
one place were some beds of soft brown sandstone interstratified 
with thin beds of limestone. These sandstones were scarcely con¬ 
solidated, and fell to pieces on being taken from the quarry. 
They often contained fossil shells, both Spiriferi and Product®, 
quite perfect in appearance, but so much decomposed as not to 
bear extraction, falling into white powdery fibrous carbonate of 
lime. I procured from other parts of these quarries the following 
fossils: — 
Corals. 
Stenopora Tasmaniensis. Fenestella internata. 
—- informis. - fosula? 
Fenestella ampla. Caryophyllsea. 
Mollusks. 
Producta rugata. 
__-brachythoerus. 
Spirifer subradiatus. 
__ Darwinii. 
_Tasmaniensis. 
Spirifer Stokesii. 
- Vespertilio. 
- avicula. 
Pecten squamuliferus. 
-- Limseformis. 
A few miles above New Norfolk, the banks of the Derwent 
showed cliffs consisting of alternations of sandstone with black 
and brown shales, producing a precise resemblance to parts of 
the English coal-measures. Much fossil wood, apparently parts 
of large trees, lay in these rocks. 
Similar rocks to these were frequently observed in the cuttings 
of the road-side as far as Oatlands in the centre of the island, 
and they almost invariably lay in positions so nearly approaching 
horizontally, that their dip was not appreciable to the eye. Still 
their continuity did not appear to extend unbroken over any large 
district, as not only were dykes and other masses of intrusive trap 
rocks frequent, but solid ridges of crystalline greenstone often 
intervened, and evidently cut off one portion of the paleeozoic 
rocks from the other. 
In the immediate vicinity of Hobarton there were places, as near 
Stoke and at the mouth of the valley of Risdon, where the 
palceozoic rocks had evidently been tilted up and altered by masses 
