Mr. BoGG on the Wolds of Lincolnshire. 393 



It is obvious that as the general dip of the strata of tliis district 

 forms but a very small angle with the horizon, the superficial ex- 

 tent of the different beds occupies a greater stretch of country than 

 from their thicknesses might at first be apprehended : in the section 

 indeed, these measures are represented at considerable angles, yet 

 by keeping the circumstance above mentioned in view, I hope it 

 will be found to answer the purpose for which rt is intended. 



The marshes betwixt Louth and the sea. No. 1 of the section, 

 consist principally of unstratified clay, with mixtures of sand and 

 various marine depositions, which tend to prove that this mass of 

 earth has been left by the ocean. A further confirmation of this 

 may be derived from tracing the sites of the different old banks 

 which once evidently formed the boundaries of the sea, which has 

 now retired a considerable distance from them. 



Proceeding westward we come to the basset of the chalk No. 2, 

 being the highest stratum in this district. It forms the principal 

 part of the Wold hills, extending in this section from Louth to the 

 highest hills in Donington, a distance of about six miles : this stratum 

 dips under the marshes ; for on boring in them for water, the chalk 

 is always found. On arriving at this, the workmen never fail to 

 come at springs, and generally of sufficient strength to fiow up 

 higher than the surface, thereby justifying the conclusion that this 

 bed is the uninterrupted continuation of the same chalk, the rough 

 elevated basset of which forms the Wolds ; and by the pressure of 

 the water in which, the fountain springs obtained by boring in the 

 marshes, are at once accounted fo«*». 



In the neighbourhood of Tetney, a village situated on the coast 

 are natural outlets of water called blow-wells ; their depths have 

 never yet been ascertained, but we cannot entertain a doubt of 

 their communicating with the chalk. These wells overflow with a 

 Vol. jii. 3 d 



