no A RAMBLE UP BURNHOPE. 



ordnance survey section of the Burtree Pasture mine (No. 13 

 in sheet No. 63). There, it is shown in great thickness, 

 below a thin hmestone, erroneously, I think, named the Tyne- 

 bottom in the section, but really the Singlepost, and above a 

 thick limestone, the Tynebottom, erroneously named the Jew 

 on the sheet. 



In the section of the Slitt mine (No. 12 on the same sheet) 

 the whin appears in quite a different horizon, namely, below a 

 thick limestone, the Tynebottom. 



The Burtree Pasture mine is rather more than half a mile 

 north-east of Burtree Ford, and the Slitt mine is near West- 

 gate, three and a half miles east-south-east of the Burtree 

 Pasture mine. 



Now if the sections of these two mines be placed side by 

 side there is a wonderfully close agreement all the way down 

 from the Nattrass Gill Hazle, the surface formation at the 

 Slitt, to the Cockleshell Limestone. But then there occurs a 

 great discrepancy. Whereas, in the Burtree Pasture section, 

 there are but two thin sandstones and one shale, only a few 

 feet thick altogether between the Cockleshell and the Tyne- 

 bottom Limes ; in the Slitt section there are eight beds of 

 sandstone, eight beds of shale, and two of limestone between 

 the Cockleshell and the Tynebottom, somewhere about a 

 hundred feet in thickness. The Burtree Pasture mine is 

 carried down from the Firestone Sill, through the whin into 

 a limestone below, the Slitt mine is carried from the Nattrass 

 Gill Hazle into the whin, but not through it. Fold a tracing 

 of Burtree Pasture mine so as to bring the two whetstone beds 

 together, blotting out the whin, and lay it alongside of the 

 Slitt mine section, and it will be at once evident that what is 

 called the Tynebottom limestone in the Burtree section corres- 

 ponds with the unnamed twin limes of the Slitt section, that 

 the underlying shales and sandstones of that section are repre- 

 sented by the whetstone of the other, and that the so-called 

 Jew limestone of the Burtree section is really the Tynebottom. 

 And therefore the whin somewhere between the two mines has 

 changed its horizon, and has burst up through the Tynebottom 



