Mr. N. Wood on the Geology of Northumberland, S^c. 325 



agree in position with those of Fallowfield and Wall Fell (one bed of 

 Limestone occurring at Belsay and Stamfordham, between them and the 

 Grit Rocks), yet the Limestone above the Coal is in two beds. At 

 Fallowfield, however, the Little Limestone is divided by a thin parting 

 into two distinct layers, or, as the miners term it, into " two posts ;" 

 probably these two layers may, to the east, be divided by the interpo- 

 sition of a bed of Plate, which gradually increasing in thickness, ultimate- 

 ly forms two distinct beds of Limestone- 

 Proceeding north-east from Kirkheaton, the same bed of Coal may be 

 traced to Capheaton and Wallington. At Brinkburn, on the Coquet, a 

 seam of Coal is worked nearly three feet thick, lying below a bed of 

 Limestone, and underneath which lie some thick beds of Limestone. Fol- 

 lowing this direction, we come to Newton and Shilbottle, which appears 

 to be the same bed of Coal (for a Section of which see Geo. Trans, vol. 

 i., part iv.). From this they range north-east, where the denudation of 

 the Aln cuts them out ; but we find the accompanying Limestones run- 

 ning into the sea to the south of Howick, as exhibited in the coast 

 Section 



Along the whole course of this line we have only one or two beds of 

 Limestone to the south, which, being in the direction of the full dip, 

 shew that they overlie the preceding Coal bed and Limestones. These 

 beds of Limestone have, in some places, workable beds of Coal lying 

 underneath them, as near Hexham Bridge, at Shildon near Newton 

 Hall, Stamfordham, Belsay, &c. 



Tracing these strata to the south, we find thick beds of coarse gritty 

 Sandstone, overlying the Limestone ; as at Unthank, above Haydon 

 Bridge, and along the south-west bank of the river Tyne, to and below 

 Hexham ; then, crossing the river, we meet with them again at Bear], 

 Horsley, Harlow Hill, Berwick Hill, Saltwick, Helm-on-the-Hill, &c. 

 &c., which are identical with the Millstone Grit, and which dip through- 

 out the whole extent of that range underneath the Coal Measures. 



Although the position of these thick beds of Sandstone, with respect 

 to the other parts of the series, agrees accurately with the Millstone Grit 

 of Derbyshire, &c., yet it is necessary to remark, that on the north side 



