i Guettard' s Miner alogical Maps 1 9 



Countrys, together with tables of sands and clays, such 

 chiefly as are found in the north parts of England, drawn 

 up about ten years since, and delivered to the Eoyal 

 Society, March 12, 1683, by the Learned Martin Lister, 

 M.D." 1 



It may be doubted, however, whether this proposal of 

 Lister's, which does not appear ever to have taken any 

 practical shape, was known to Guettard, who, though he 

 obtained a large amount of information about English 

 mineral products, probably derived it all from French 

 translations of English works. He does not appear to have 

 read English. Guettard inferred, from his observations 

 over the centre and north of France, that the several 

 bands of rocks and minerals which he had detected were 

 disposed round Paris as a centre. The area in the middle, 

 irregularly oval in shape, comprised the districts of sand 

 and gravel, whence he named it the Sandy band. It was 

 there that the sandstones, millstones, hard building stones, 

 limestones, and gun-flints were met with. The second or 

 Marly band, exactly surrounding the first, consisted of 

 little else than hardened marls, with occasional shells and 

 other fossil bodies. The third band, called the " Schitose " 

 [Schistose] or metalliferous, encircled the second, and was 

 distinguished by including all the mines of the different 

 minerals, as well as the pits and quarries for bitumen, 

 slate, sulphur, marble, granite, fossil wood, coal, etc. 



Having convinced himself that these conclusions could 

 be sustained by an appeal to the distribution of the 

 minerals in the northern half of France, he proceeded to 

 put upon a map the information he had collected. Using 



1 Phil. Trans, vol. xiv. p. 739. 



