W. A. Richardson— The Origin of Cretaceous Flint. 543 



gedrtdl flint fine 



\~ \Bdrrois Spooqe Bed 



'Hhittdheti febuhr 



gg M 



S . 



/lo(dtior) 



Tdbuldi flinl. 



^i Ffmt tines 



.^;-|5fdf feW flint-r- 



D" 



inMbi 



Kent, 



jV* 



Zonal Index 



/. 5. 



Z H si/b-gbbe>sui 

 3. ff. Curie /? 



5 H- planus. 



6. ff. car tcstudindnumf: 

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6 tldruipitn 



5 



10. B rnucrondti 4 



// luridta 



3 



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Dorset 



Fig. 3.— Vertical distribution of Flint in the Chalk. 



