39S Mr. BoGG on the Wolds of Llncolttshirc. 



and fossil wood, &c. together with specimens of all the earths and 

 stones, more or less worn by trituration, which the district pro- 

 duces ; I apprehend also that fragments of strata are deposited here 

 which have come from a great depth, for pieces of very pure 

 laminated coal are frequently to be met with which burn with a 

 very bright light, and leave but a small residue of ash. Other 

 pieces of jetty coal often occur breaking with a conchoidal fracture, 

 but these agree in every respect with a thin stratum of this fossil 

 which has been discovered at superficial depths in some situations 

 in the shale stratum. 



On the Lincolnshire coast, a considerable quantity of coal agree- 

 ing in properties and appearance with the latter of these varieties, 

 is washed up by the sea, and is often collected by the poorer sort 

 of the inhabitants for fuel ; and along with this particular species 

 of coal, slates similar to those in the shale measures often occur, a 

 fact which gives us reason to suppose that the seam of coal from 

 which these specimens have been displaced extends under the 

 incumbent strata already noticed, into the sea, where the coal seam 

 is denudated and from whence these washings proceed. 



As the discovery of coal would be a circumstance of much 

 importance to this country, it might be worth while to have it 

 ascertained whether a seam of this jetty coal (called by the country 

 people ^rowf/) does not exist in sufficient thickness, and at such a 

 depth, as would render it worth the miner's pursuit ; the expense 

 of the boring requisite for this purpose might be defrayed by a 

 subscription among the different land proprietors in the district. 



