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HUTTONIAN THEORY. 



453 



now entirely covered by the fea *. The fub- 

 marine ftratum which contains the remains of 

 this foreft, can be traced into the country to a 

 great diftance, and is found throughout all the 

 fens of Lincolnfhire. The flratum itfelf is a- 

 bout four feet thick ; it is covered in fome pla- 

 ces by a bed of clay fixteen feet thick, and un- 

 der it for twenty feet more is abed of foft mud, 

 like the fcourings of a ditch, mixed with fhells 

 and lilt. 



Here then we have a ftratum which muft 

 have been once uppermoft on the furface of the 

 dryland, though one part of it is now immerfed 

 under the fea, and another covered with earth, 

 to the depth of fixteen feet. A change of level 

 in the fea itfelf will not explain thefe appearan- 



they can only be explained by fuppofing 

 the whole trad of land to have fubfided, which 

 is the hypothefis adopted by the author of the 

 defcription in the Tranfadions, M. Corria de 



^ ; the fubfidence, however, is not here 



ces 



Serr 



underftood to arife from the mere yielding of 

 fome of the ftrata immediately underneath, but 

 is conceived to be a part of that geological 

 ftem of alternate depreffion and elevation of the 

 furface, which probably extends to the whole 

 *^ ""1 1"'] mineral kingdom. To reconcile all the differ- 



Ff3 



ent 





* 1*^1- Tranf. 1799. P- ^^45 



