Professor J. W. Judd—Wm. Smith's MS. Maj)S. 443 



1. Chalk, 300 feet (Chalk, Upper and Lower). 



2. Sand, 70 feet (Firestone, Upper Greensand). 



3. Clay, 30 feet (Gault). 



4. Sand and Stone, 30 feet (Portlandian or Cornbrash?). 



5. Clay, 15 feet (Bradford Clay ?). 



6. Forest Marble, 10 feet (Forest Marble). 



7. Freestone, 60 feet (Great or Bath Oolite). 



8. Blue Clay, 6 feet \ 



9. Yellow Clay, 8 feet f tti n » tp iu q • 

 in inn > ti^ l\ n f t. > i uller s Fiarth benes. 



10. Fuller s Earth, b feet I 



11. Bastard ditto and sundries / 



12. Freestone, 30 feet (Inferior Oolite). 



13. Sand, 30 feet (Midford Sand). 



14. Marie Blue, 40 feet ) -j^.^^ 



15. Lias Blue, 25 feet ji 



16. Lias White, 15 feet "i -p, ,. 



17. Marlestone Indigo and Black Marie, 15 feet j 



18. Red-ground, 180 feet (Trias). 



19. Milstone v 



20. Pennant Stone i 



21. Grays > Carbonifei'ous. 



22. Cliff \ 



23. Coal J 



The absence of distinctive names to the strata, with the inadequate 

 thicknesses assigned to some of them, and some minor errors as to 

 the order of succession, afford sufficient evidence, if this were 

 needed, that the document is really of the early date which it bears. 



The second document in this series is even more interesting, as 

 it may be justly regarded as the oldest geological map in existence, 

 if we distinguish geological from agricultural or soil maps. We 

 cannot do better than tell its history in Smith's own words — 



'• During my five years' close confinement " (1794-99) " to prac- 

 tical engineering on the Coal Canal, my mucli-wished-for oppor- 

 tunity of collecting observations enough from the ranges of the 

 different strata to make an accurate delineation of the stratification 

 throughout England were suspended." 



But after his connection with the Coal-Canal works had ceased, 

 Smith adds — 



" I drew in colours, on a map of the vicinity of Bath and on 

 Day and Masters' County Survey, all very accurately to a certain, 

 extent, which embraced an interesting but intricate variety of strata 

 in hills around Bath." ^ 



The geologically coloured copy of Day and Masters' Map of 

 Somersetshire (on the scale of one inch to a mile) was publicly 

 exhibited and explained by Smith at an annual Agricultural Meeting 

 at Bath in the year 1799. This map unfortunately has been lost, 

 but the Map of the Vicinity of Bath is one of the documents 



1 PMllips' "Life of WilUam Smith," p. 27. 



