186 Mr. Pattinson on the Fossil Trees found in Jefferies 



The continuity of any one vein in this series cannot, indeed, be 

 traced for the entire distance ; but it is probable that the whole 

 have been formed by some general power operating in a direc- 

 tion nearly east and west. 



Jefferies Rake vein has been worked for a great number of 

 years, and has yielded considerable quantities of lead ore, which, 

 has been principally raised in the upper series of lead mea- 

 sures above the great limestone of this district, numbered 153 

 in Forster's Section of the Strata, and marked " Great lime- 

 stone " in a copy of this section, vol. xlv. plate 2. of the Phi- 

 losophical Magazine. Here the strata of sandstone, called 

 provincially " Hazels," are much thicker than in many other 

 places not far distant, where they have been sunk through, 

 which circumstance has rendered the mining ground at Jefferies 

 Rake much more valuable. The vein was formerly worked 

 by shafts from the surface ; but the adit mentioned by Mr. 

 Witham called Deborah's Level, was driven up to the vein 

 some years ago, and by means of it the workings have been 

 carried considerably deeper towards the eastern extremity. 

 Here an engine-shaft was sunk to the adit level thirty-eight 

 fathoms, and below the adit fifty fathoms, and out of this shaft 

 galleries or drifts are still driving in the vein at various heights, 

 to explore the ground in an easterly direction ; in one of these 

 galleries or drifts the fossil trees forming the subjectof this com- 

 munication were discovered. The following is a section of the 

 strata sunk through in the engine-shaft just mentioned, com- 

 municated to me by Mr. Dolphin : — Fath. Ft. 

 Part of a sandstone called the Routen-well Sill ... i 



Slate clay or plate 4 



Sandstone called the Slate Sill 8 



Plate t 



Sandstone called Hippie's Sill 8 



Plate 10 



To floor of adit level 38 



Below the adit to the floor of the drift or gal-"! 



lery in which the trees were discovered — r ^5 



sandstone called the Grit Sill } 



Immediately upon the sole of this drift is a plate 

 or fump bed from six to twelve inches thick, 

 called very properly by Mr. Witham a " thin 



stratum of bituminous shale much carbonized." ■ 



53 



. Below this drift— Grit sill 25 



Craig sill 8 



Plate '^ 



88 

 The 



