RECORDS OF IV. A. MUSEUM. 
[69 
river, north of the Base Line W.B.-E.B. 1 This would account for 
the omission of the name of the river, for Hardman would, no 
doubt, consider this localisation sufficiently distinctive. 
In paragraph 302 of this Report, Hardman writes, “ Base Line 
Camp to Hardman Range. On this side of the river the prevailing 
rock is limestone, which crops out from under the alluvium and soil 
in low ridges, bearing a little N. of E. In the present section, only 
one of the ridges is visible. It is about half a mile wide, and has 
been traced for 10 or 12 miles in a direction to E.-N.E., about two 
miles from the river and parallel to it.” 
It may be that these limestone beds do not outcrop in the bed 
of the river close to Camp Z 27, for the only rocks mentioned in 
paragraph 298 as having been observed in the river bed between 
the Base Line Camp and J 34 are “ a few beds of red shales and 
micaceous mudstones.” The limestone may extend north of the 
patch mapped by Hardman, but it must be admitted that some 
of Hardman’s localisations are not very precise. As an example of 
this it may be mentioned that in paragraph 322 he states : “ Lead, 
zinc, etc., have been noticed in the form of Galena in the limestone 
rocks a little south of the Base Line (Ord River),” whereas in the 
Appendix we read that specimens “ Hb 27. Limestone with lead, 
zinc, and fossils” came from “ River south of Base Line Camp.” 
Therefore, as these minerals and fossils were collected either in the 
(Elvire) river south of Base Line Camp or (Limestone) ridge south of 
the Base Line (see specimen HB 18) it may, I think, be concluded 
that the Hardman Trilobite also came from one of these two 
localities, presumably from the former. 
As stated above, one of the Olenellus fragments was obtained 
from a locality some distance away from the Base Line Camp 
specimens. This is taken to be the one referred to as “Ord River” 
in the British Museum List of 1908, and is doubtlessly specimen 
HB 48 of Hardman’s Appendix, localised as “ River bed Ord, near 
J38” 2 In paragraph 304 Hardman writes: “About five miles 
below the junction of the Elvire and the Ord, limestone crops out 
in the river bed, and in low ridges through the alluvium to the 
1 In Mr. Maitland's Presidential Address this line is incorrectly referred to as 
W.B.-E.F. ; loc. cit., p. 141. 
2 Loc. cit., p. 37. 
