146 PEOCEELINGS OF THE GEOLOGICAL SOCIEXr. 



4. That a barrier, or tract of dry land, existed nearly across Cen- 

 tral England, dividing the Carboniferous Rocks into two distinct 

 regions. 



5. That to the north of this barrier the ^' sedimentary " strata of 

 the Carboniferous Period become attenuated from north-west to 

 south, while the calcareous strata thin out from south to north, 

 Derbyshire being the centre of greatest development. 



6. That to the south of this barrier the ''sedimentary" strata 

 become attenuated from west to east ; while the calcareous thin out 

 from east to west. 



7. That, while on the north side of the barrier there was a cur- 

 rent bringing the sediment from the north, on the south side there 

 was a current bringing sediment from the west. 



8. That richly productive Coal-measures do not exist under the 

 Eastern Counties. 



