MACKIE — RA.MBLE IN THE NORTH OF ERANCE. 



123 



this wonderfully diversified and miniature area should not have been 

 more worked. 



Then came Abbeville and its gravels, and its fine old church, and 

 its statue in the market-place ; then the glorious cathedral of Amiens- 

 Then a week's gaiety in Paris, and more than another week spent at 

 Rouen and along the Seine, until a temporary stay at Frascati's gave 

 me the opportunity of commencing but not finishing a study of the 

 cliffs of Havre. The main cliff, or falaise, consists of the Lower or 

 Grey Chalk, which there contains numerous beds of large chert no- 

 dules, in similar manner to the bands of flints in our Upper Chalk- 

 The subdivisions of these beds I could not completely make out from 

 top to bottom, but the notes I made are sufficiently accurate as far 

 as they go, and for this reason are worth giving side by side with the 

 subdivisions of the French geologist, M. Le Soeur, in 1843, it being 

 borne in mind that the thicknesses of the strata, as given by me, are 

 estimated by eyesight only, and not by actual measurement. 



I. Subdivisions of the Cretaceous and 

 Wealden Formations recorded by M. 

 Le Soeur at the Cliff under the Light- 

 house at Cap La Heve, 1843. 



Terrain Diluvien : — 



Argile rouge ; sable fin ; silex pyro- 



matique. 

 Craie Inferieure : — 



Craie chloritee grise ; lits et rognons 



de silex. 

 Bandes de silex. 

 Craie glauconeuse blanche. 

 Bandes de silex. 

 Lits et rognons de silex. 

 Bandes de silex. 



Craie glauconeuse blanche et rognons 



de silex. 

 Bandes de silex noir. 

 Craie glauconeuse brune ; rognons de 



silex; polypiers. 

 (Sources.) 



Lits tendres endurcis de glauconie 

 verte. 



Lits de marne bleue noire pyriteuse, 



avec lits de silex calcedoneux. 

 Grros gravier ferrugineux. 



Section at Cap La Hive (MacJcie.J 



ft. in. 



Double chert 0 8 



1. Chalk 0 10 



Ditto ..14 



2. Chert 0 6 



Chalk 0 8 



3. Chert 0 6 



Chalk 10 



Parting. 



Chalk 0 10 



4. Chert nodules, large and white 1 0 

 Chalk 



5. Chert nodules 0 8 



Chalk — weathers in. 



6. Chalk 10 



Blue Parting. 



7. Band of chert 0 10 



8. Greenish sandstone ... 0 9 



9. Greyish green- grained chert, 



wanting at places ... 0 6 



10. Greenish-yellow soft sand- 



stone 0 6 



11. Band of cherty dark stone . 0 9 



12. Seam of dark-grey stone ..08 

 Micaceous friable sandstone 



(soapy) ...... 0 8 



