128 BULLETIN :: MUSEUM OF COMPARATIVE ZOOLOGY. 
in the position in which they lived and died” (Oldham, a, p. 121). 
The deposits of several localities are described by David, who, in 
addition to his own observations, gives a bibliography of the subject. 
At Hallet's Cove near Adelaide the boulder-beds rest on a striated 
pavement on which the striae run from north to south. The glacial 
beds consist of reddish brown clay slates, sandy in places and fairly 
well stratified, especially in the upper part. Downward they pass 
into sandy grayish brown sandstones, containing well-striated boulders 
in abundance. The latter are distributed only sparingly in the upper 
part of the deposit. The boulders range in size up to masses of eight 
tons’ weight and have a possible source thirty-five miles south. The 
thickness of the boulder-beds ranges from twenty-three to one hundred 
feet. There are no traces of organisms in the matrix, which is local 
in character (David, p. 294). At Wild Duck Creek, Victoria, the 
striated pavement is again noted. The glacial beds consist of mud- 
stones, with erratics reaching the size of thirty tons, and. sandstones. 
Nearly all the erratics and small boulders are beautifully polished 
and faceted. The formation has been traced over an area fifteen 
and one-half miles long and five miles wide. Its thickness varies 
from 300 to 400 feet and the materials appear to be derived from a 
southerly source (ibid., p. 295). 
The Bacchus Marsh Beds in Victoria also rest on a striated pave- 
ment with uneven surface. They consist-of mudstones, conglomerate, 
and sandstones. The mudstones are hard and soft, varying in color, 
with a small proportion of fragments of undecomposed feldspar, 
minute chips of black shale and small pieces of carbonized plants. 
The soft mudstones consist of clayey material with quartz grains, 
mostly subangular, and contain sparingly glacial erratics: The hard 
mudstones contain numerous firmly embedded erratics that are fre- 
quently flattened and have diameters up to five and one-half feet in 
length, though the fragments are usually less than one foot long. 
The maximum thickness of individual beds is 193 feet (ibid., p- 296). 
The conglomerates are composed of well-rolled pebbles one to six 
inches in diameter. They have an irregular under surface because 
they rest upon the irregularities of the lower beds. The maximum 
thickness of individual beds is twenty feet. The sandstones are hard 
and soft, coarse and fine, frequently laminated, and occasionally 
showing distortion, especially in the neighborhood of irregular pockets 
of conglomerate. There are well-preserved plant remains in the last 
two horizons. The thickness of the individual beds is thirty to one 
hundred feet. The thickness of the entire series, according to the 
