320 PKOCEEDIXGS OP SECTION C. 



Iccalities, and with seven recognisable species. A little nearer to 

 Ballarat, and somewhere about the same strike, we get at Clarendon 

 a mixed Bendigonian and Lancefieldian fauna. We are again on the 

 border line as w^e were at Inglewood, and T. approximaiiis is again 

 in evidence. 



We have then about a dozen miles south-easterly from Ballarat, 

 at Clarendon, a basal Bendigonian fauna, succeeded on the east by 

 Lancefieldian. If the strike continues unchanged, this line would 

 pass through Ballarat. On the continuation of the same line, and 40 

 miles to the north, we reach Wareek, where again we find Lance- 

 fieldian. The presumption is tlu\t Ballarat is low down in the 

 Ordovician. 



Westward of the Bealiba-Ballarat line of strike is a large area 

 of ancient rocks that have yielded no fossils as yet. The excellent 

 results that have ensued from the painstaking investigation of the 

 unpromising rocks of the Dunolly district lead us to hope that careful 

 search among these w-estern rocks uiay not be without valuable 

 results. 



In conclusion, I have to thank Mr. E. J. Dunn, the Director of 

 Geological Surveys, for allowing me to give some unpublished facts 

 which have come to my knowledge during my examination of 

 Oraptolites for the Department of Mines. 



12.— PETEOLECM. 



By DAVID DAT, United States Oeolorjical Survey. 



13.— GOLD MIXING IN WEST AUSTRALIA, WITH REFERENCE TO 

 THE GEOLOGICAL FEATURES OF THE STATE. 



By C. 0. G. LARCOMBE. Curator and Lecturer, School of 2Iines. Kalr/oorlie. 



14._THE METEOR CRATER OF ARIZONA. 



By GEORGE P. MERREL, Hcnd Cnmfor of Geology, U.S. Xatl. Museum, Washittyton, 



B.C., U.S.A. 



In 1891 public attention was first called to a remarkable crater- 

 like depression on the plain in the neighbourhood of Canon Diablo, 

 Coconino County, Arizona, through the finding in its vicinity of 

 numerous masses of meteoric iron. So numerous were these — several 

 thousands, large and small, having been found — and so remarkable 

 was the crater, that it was early suggested that there might possibly 

 be a genetic relatiouvship l^etween them. The subject w-as studied 

 systematically by Mr. G. K. Gilbert, of the U.S. Geological Survey, 

 who gave the substance of his residts in 1896 under the caption of 

 '' The Origin of Hy])otheses.'' It is sufficient for our present pui'poses 

 to state that j\Ir. Gilbert did not find such data as he felt warrante(^ 

 him in accepting any such conclusions, and he was forced to accept, 

 tentatively, the alternative hypothesis of vulcanism, though the com- 

 plete absence of volcanic products in the vicinity was recognised as 

 unaccountable, excepting upon the ground that tho crater was formed 



