Akt. XX. — On an Unnoticed Feature of the Faulting 

 at Ballarat East. 



By T. S. hart, M.A., F.G.S. 



(With Plate XXXII.). 



[Eead 8th December, 1903]. 



The Ballarat East Goldlield has been described by Mr. Ernest 

 Lidgey, in a Special Report issued by the Department of Mines, 

 Victoria, in 1894. 



The faults are there grouped as follows : — 



Faults which occurred before and during the time when 



quartz veins and lodes were being formed. 

 Faults which occurred after the quartz veins and lodes 

 were formed, including — 



Strike faults coinciding with the bedding planes. 



Strike faults, or slides, crossing the strata in 



their dip. These are always reversed faults. 



Dip faults or crosscourses. 



It is to the nature of the movement on these dip-faults, or 



crosscourses, that I now wish especially to call attention. 



Some 46 of these crosscourses are siiown on a plan accom- 

 panying Mr. Lidgey's report. 



He notices with reference to them that they are more recent 

 than any of the other faults ; that the down-throw is on the 

 hanging wall side, and they are consequently normal faults, and 

 that the apparent heave is always on the side of the greater 

 angle, that is, the greater angle in a plan of the intersection of 

 crosscourse and strata. 



More recent observations corroborate these conclusions ; but 

 an unusual case seems to occur in the North Woah Hawp Co., 

 of a small apparent heave in the other direction, and possibly 

 may also occur on a few crosscourses whose strike is nearly 

 at right angles to that of the strata. 



For a number of these crosscourses the amount of the 

 " apparent throw " and " apparent heave " is stated in a list in 

 Mr. Lidgey's report. 



