210 WALTER HOWCHIN 
Among the included erratics are angular masses of slate carry- 
ing Silurian fossils. The nearest source for such erratics, according 
to Mr. W. H. Twelvetrees, is upward of 30 miles to the southwest 
of Wynyard; while examples of a pink granite, which also occurs 
as bowlders in the till, is not found nearer than the ranges, also to 
the southwest, and about the same distance away. The most 
angular blocks contained in the till consist of graptolitic slates, 
resembling the rocks of the immediate neighborhood, a strong 
argument in favor of the agency of land ice. ‘The erratics are 
mostly of moderate size but are found up to 5 feet in diameter, 
and, on the statement of Professor David, a large proportion is 
intensely glaciated. 
An interesting feature in the Wynyard beds, discovered by 
Professor David, was the existence of striated pavements in the 
body of the till, at three distinct horizons. Concerning these he 
Says, 
As a rule striated pavements were not observed in the bowlder clay where 
it was of considerable thickness, such striated pavements as were noticed 
appeared to be restricted to thin patches of bowlder clay interbedded with 
conglomerate. .... In most cases the grooving and striation is about N. 30° 
E., that direction being the lee side so that the ice in thislocality evidently moved 
from about S. 30° W. toward N. 30° E. (XXIII, p. 277). 
In the southern portions of Tasmania the Permo-Carboniferous 
glacial beds crop out at about sea level, along the intricate coast- 
line and islands of the southeast. Good sections are seen on Bruni 
Island (One Tree Point), where, Mr. R. M. Johnstone says, “‘water- 
worn and angular fragments of granite, altered slates, porphyries, 
quartzites, and greenstones (rocks unknown in the vicinity) are 
most abundant. Some of the blocks are huge”? (XIX, p. 121). 
Similar exposures are found in Maria Island (Darlington), where 
the glacial beds are overlain by a rich marine fauna, especially 
characterized by Eurydesma cordata and Pachydomus, typical 
Permo-Carboniferous forms of the mainland. Other localities are 
at the mouth of the Huon River, opposite Port Cygnet; and on 
the northwest coast, in the neighborhood of Strahan and north- 
ward, where the glacial outcrops have been noted by Dunn, Kitson, 
Officer, and Gregory. 
