1 12 Rev. A. Sedgwick on the Geological Relations and 



In this section, Nos. 4. 5. 6. & 7. are undoubtedly the representatives of the upper part of the 

 lower red sandstone, and they are unconformable to the overlying beds*. 



No. 4. Section from left bank of the Nid above Knaresborough Castle. 



Feet. Inches. 



1. A precipice of yellow limestone. Upper part composed of hard, cellular, "1 



concretionary beds : middle part soft, earthy, and cavernous ; the j 



cells of large size and very irregular forms. The lowest portion is ^ 70 



soft and earthy, mixed with harder concretionary portions standing | 



out ill relief J 



2. Incoherent, magnesian earth 1 



3. A conglomerate of yellow marl, with concretions of yellow limestone"! . „ 



and fragments of red sandstone J 



4. Slaty, red, micaceous sandstone and red marl 1 



5. Light and variegated slaty sandstone, with fissile portions not parallel! 



to the beds J 



6. Strong, grey sandstone, with red streaks and concretions of earthy red"! . „ 



oxyd of iron. Lowest portion concealed j 



The beds below No. 3. are a part of the lower red sandstone ; and the stratification is so 

 obscure that it is not easy to determine whether they are or are not parallel to the yellow lime- 

 stone. 



No. 5. — Sections of the Hetton, Ellemore, and Eppleton Pits near Houghton- 

 le-Spring in Durham^ taken in 1826 f. 



1. lletton Pit. 



Feet. Inches. 



1 . Sand and gravel 15 



2. Limestone marl 18 



3. Yellow limestone, with much water 93 6 



4. Blue limestone, a kind of ragstone, and here and there of slaty texture. . 44 2 



5. Blue metal (slate clay) 3 2 



6. Red rotten sandstone 4 4 



7. White and grey metal 1 11 



8. Strong, brown limestone and whin 8 8 



9. Blue and grey metal • • • 32 3 



10, Coal 1 4 



The pit descends through the high and loio main to the Ilutton seam, which is nearly nine 

 hundred feet below the surface. In this section. No. 4. (and perhaps also a part of No. 3.) re- 

 presents the marl-slate. No. 6. and a part of No. 3. appear to represent the lower red sandstone 

 in a degraded form. 



2. Ellemore Pit, about a mile S.W. by S. from the former. 



Feet. Inches. 



1 . Soil, and strong blue clay 49 



2. Limestone marl 1 6 



3. Yellow limestone 60 



* See Plate VI. fig. 2. 



t For these important sections I was indebted to the superintendant of the Great lletton coal 

 works. See Plate V. fig. 3. ; and p. 74. 



