CRUSH-BRECCIATION IN THE MAGNESIAN LIMESTONE 47 



limestone about 40 feet in thickness. This rock is much 

 fissured and disturbed. The fissures are vertical, and 

 many are of considerable width, reaching as much as 40 

 feet across. They are filled with fragments from the beds 

 immediately above, and in one case the fissure must have 

 been opened twice, as there is evidence of two distinct 

 infillings. Some of these fissures can be seen to pass into the 

 top of the Brecciated Limestone, but presumably they do not 

 penetrate far into it. In this zone the chief breccia gashes are 

 also found. These are triangular in section, tapering down- 

 wards, and are filled with fragments, generally firmly cemented 

 together, of a hard, minutely-concretionary bed, that follows 

 immediately above the soft yellow beds. This layer is wedge- 

 shaped, thinning out gradually to the south. It is followed 

 by about 80 feet of regularly-bedded limestone, which is but 

 little disturbed, except for one or two fissures that occur in it. 

 The material filling one of these is special!)'' interesting, as it 

 shows a gradual increase in brecciation from top to bottom. 

 At the top of this group is the flexible limestone, which 

 becomes of great importance as an aid in tracing out the beds 

 in the folded and fractured area that follows. In the clifl^just 

 south of the stack known as Lot's Wife a fault, which has 

 been widened by erosion and filled with breccia, occurs. It 

 has a throw of about 30 feet to the south, and shifts the 

 flexible limestone from near the top to the base of the section, 

 thus bringing in higher strata of the Middle Permian. 



From this point southwards past the " Grotto " the beds are 

 of a very irregular nature, there being an intermixture of hard, 

 white, crystalline with soft, yellow beds. Their total thickness 

 is difficult to estimate, partly owing to the thickening and 

 dying out of certain beds, but also much more because of the 

 folding and thrusting that has taken place. It however 

 probably reaches about 120 feet. The main hard, white, 

 crystalline bed, which is about 50 feet thick at its maximum, 

 is a lens-shaped mass, which thins out very irregularly on the 

 north side into long tapering beds, but on the south dies out 

 gradually, finally ending a little to the south of the "Chimney." 



