Glacial Action in Australasia. — Hitchcock. 255 
Professor Tate also refers to Mr. Selwyn's early observa- 
tions of phenomena discovered farther south in the valley of 
the Inman, Cape Jarvis peninsula, who says that the direction 
of the grooves and stride is east and west, in parallel lines fol- 
lowing the course of the stream. Rounded surfaces of mica 
slate on the south flanks of the Kaiserstuhl and other parts of 
the Adelaide chain are less satisfactory, although suggestive as 
collateral supports. 
Mr. R. Etheridge, Jr., has personally examined the classic 
locality at Hallet's Cove, and is quoted as believing it to be not 
improbable that the glaciated rocks extend beneath the ma- 
rine Tertiary. 
TASMANIA. 
In 1884, Mr. R. W. Johnston communicated to the Royal 
Society of Tasmania the discovery of evidences of ice action in 
rocks of Permo-Carboniferous age at Maria island, consisting 
of erratics exceeding one ton in weight. This island is about 
fifty miles easterly from Hobart. Two years later he discover- 
ed similar erratics and polished blocks of the harder rocks for- 
eign to the neighborhood at One Tree point, on Bruny island, 
south from Hobart. Still later he has found abundant evi- 
dences of similar nature in the same terrane in many other 
places in southeastern Tasmania. 
An excellent summary of all that has been discovered of ice 
action in Australasia is given by Mr. Johnston in the Proceed- 
ings of the Royal Society of Tasmania for 1893. Concerning 
these Tasmanian exposures, it is noted that the ice-borne con- 
glomerates occur in more or less barren layers of the lower 
marine beds known locally as "Mudstone rocks." In numer- 
ous localities, including Blackman's bay, Variety bay. Adven- 
ture bay, Esperance, etc., the erratics are associated in dense, 
white or yellow, close-grained mudstones, containing many or- 
ganisms, of which- I will only mention the genera, namely, 
Spirifera, Terebratula, Sanguinolites, Pachydomus, Edmon- 
dia, Aviculopecten, Tellinomya, Platyschisma, Orthonota, 
Astartila, Theca, Goniatites, and the fern Gangamopteris. 
The erratics are not associated with the finely laminated zones 
which are almost wholly made up of the remains of the com- 
mon lace-like Fenestellap. The polished boulders mostly occur 
in what must have been at the time of deposition an exceeding- 
