Sedimentary Rocks. 41 



above Gisborne it is often called the Gisborne Creek, and be- 

 low Sunbury, the Jackson's Creek, which is the^ name adopted 

 by the Military Survey for its contoured plan, and will be the 

 name used throughout this paper. 



The Pyrete Creek is unnamed on the Quarter Sheets, on the 

 Geological Survey Map of Victoria, and on the county plan 

 ■of Bourke. On this last plan its lower course is shown as the 

 Coimadai Creek, which is the local name for that portion of 

 it On the Military Survey map the name is spelled Pyrett. On 

 the county plan a small eastern tributary of the Djerriwarrh is 

 called the Parrait. 



On the Quarter Sheets, east of the Gisborne-Melton Road we 

 have, in order from west to east, the Toolam Toolern, Yangar- 

 dook and Kororoit Creeks. On the county plan the first becomes 

 the Toolerrn Toolerrne! On the military map it is abbreviated 

 .to Toolern Creek, its local name, while the Yangardook becomes 

 Condon's Creek. 



Broadbent's "Holiday Map," which, though unofficial, is of 

 great help in the field, is very inaccurate as regards names in the 

 Pyrete district. The upper Pyrete is not marked; the course 

 •of Goodman's Creek and neighbouring streams, apparently copied 

 from the defective county plan, are incorrect. Goodman's Creek 

 should flow south; the stream shown as the Cockatoo is known 

 locally as Cataract Gully, Cockatoo Gully being a smaller gully 

 nearer Coimadai ; while the name Durdiwarrh, borrowed from 

 the Steiglitz district, is misapplied to the Djerriwarrh, and the 

 Toolern Creek is called the Toolam Toolam. 



On QS. 6 S.E. the fossil locality at the mouth of Riddell's Creek 

 is shown as Ba 68, instead of Ba 67. McCoy 6 in referring to 

 the same locality calls it " Ba 67, Section 24, Parish of Bulla." 

 The outcrop in Section 24, Bulla, is Ba 68. 7 



IV. — Classification of Rocks in the Area. 



(a) Geological Survey Classification. 



From the account of previous work it will be seen that the 

 'Geological Survey Quarter Sheets are geologically the chief 

 guide for the greater part of the district, though we have availed 

 •ourselves of the Memoir of Messrs. Skeat and Summers in our 

 work on the Macedon section, while Dr. Fenner's paper has also 

 been of use. 



6. 1, Dec. 1, pp. 10, 11, 12. 



7. Communicated by Mr. F. Chapman, A.L.S., National Museum. 



