105 



at these singular cliffs. I felt quite a relief when my examina- 

 tion was completed, and I got away from so dangerous a post." 

 (loc. cit., I. p. 338.) 



Section of Wilson's Bluff. 

 [See pi. iv., fig. 3.] 









Thickness. 







Feet. 



Inches 



I. Grey to brown crystalline limestone, cast of shells 



50 







II. Yellow friable polyzoal 



limestone 



12 







III. a. Hard white limestone full of palliobranchs . . 



2 







, { Unseen . . 

 ' \ Bough chalk rock . . 



. . 



56 



8 





. . 



9 



8 



c. Layer of Gryphaea, &c. 





. 







d. As b 





. 



49 



8 



e. Irregular layer of flint 





. . 







/. White chalk.. 





. . 



30 







g. Flint layer 











h. White chalk 



.. 



40 







Total .. .. .. ..250 



Comparative sections made at various points along the cliffs 

 bear out the general observations of Flinders and Eyre 

 respecting the attenuation of the chalky stratum from west to 

 east. 



Succession of 



Wilson's 

 Bluff. 



50 



12 



188 



Thickness at Stations east from 

 Wilson's Bluff. 



strata. 



28 miles. 71 miles. 



90 miles. 



129 miles 



cliff end, 



Head of 



Bight. 



Superficial deposits of sand 



and travertine 

 Crystalline limestone 

 Friable polyzoal rock 

 Chalk 



5 



J92l 



t y J 



128 



40 



40 



100 



60 



35 



49 8" 



42 



25 



10 

 35 

 80 

 20 



Total 



250 



225 



255 



151 8 



145 



Total thickness of older 

 tertiary 



250 



220 



200 



117 



135 



As the several strata were recognised only by colour and 

 appearances produced by weathering, it is probable that the 

 thicknesses given to each stratum may not be absolutely correct, 

 though the thicknesses assigned were determined by measure. 

 Accepting the above data, the crystalline limestone seems to 

 have suffered very little from denudation, or rather, it 

 may be, that disintegration has been equally distributed. 

 Its base shows a fall of 100 feet in a distance of 129 

 miles, whilst the chalk shows in the same distance a 



