Faultimj at Ballarat East. 345 



It is not uncommon for the "apparent throw " and "apparent 

 heave " to be about equal, though the throw is in some cases 

 much less. The following table gives approximately the amount 

 of the heave clue to the vertical displacement and the amount of 

 the observed heave, and the amount of heave due to the 

 horizontal movement as deduced from these. No. 21, being a 

 north-westerly crosscourse, shows a left-hand heave, the others 

 are north-easterly and show a right-hand heave. 



In addition to these it may be noted that on the great cross- 

 course No. 34, 100 feet vertical displacement would give only 6 

 feet heave, and that to the left if the hanging wall had gone 

 down. The observed heave is 612 feet to the right. In No. 19, 

 100 feet vertical displacement would give less than a foot heave, 

 but in No. 37, where the conditions are such as to produce an 

 unusually large heave, the same vertical displacement would give 

 about 58 feet heave in vertical strata, with the ordinary average 

 strike of this field. 



Crosscourse No. 23 is noted by Mr. Lidgey as producing the 

 same heave, on the indicator, and on four crosscourses intersected 

 by it. This result could only be due to horizontal movement, 

 but the heave is small, and appears to be irregular in amount. 



T/ie evidence of the slickensides. — The walls of the crosscourses 

 and partings parallel to the walls in the fault-rock are often 

 well striated. These can usually be seen running in a variety of 

 directions, but on the crosscourses the most marked and most 

 persistent seem generally nearer to a horizontal direction than to 

 the line of dip of the surfaces, and are often almost horizontal. 

 The evidence of the striations supports the deductions from the 

 apparent throw and heave, but is itself less consistent, owing, no 

 doubt, to the fact that strong striations may result from a single 

 movement which may be itself of small importance compared 

 with the whole movement, and different in direction. 



