i4 



W. J. Perry — Megalithic Monuments 



" iron pyrites and marcasite are found more especially in the 

 Lias shales. They are most abundant in the shales of the 

 Lower Lias " (21, Chap. XL). So this formation contains 

 things that these early people required for their personal 

 adornment and other purposes. In view of the difficulties of 

 the geological problems involved I do not propose to do more 

 than draw attention to the relationship between the megaliths 

 and the Lias formation, and to suggest" that the occurrence of 

 iron, ochre, shale and so forth in this formation may have 

 been the cause of the association. 



Mr. Crawford has already been quoted as calling attention 

 in the Geographical Journal to the direct association between 

 the remains of the early bronze age and the chalk margin of 



6 STON£ 



CIRCLE 



4» CHfcMBERED 

 B&fcfVOW 



ANCIENT 



ii i U « 



Sketch Map No. 4, showing the geographical relationship between the Stone 

 Circle and Long Barrows of Derbyshire and the area of Ancient Mining. 



