UED SANDSTONE WITH GYPSUM. l<>5 



2. Yellowish grey sandstone ; 8 feet. 



3. Another bed of the same ; 5 feet. 



These three beds are parted in som^ places by seams of blue 

 clay. 



4. Indurated marly clay of a greenish blue colour, containing a 

 slight mixture of sand and mica ; 7 feet. In this stratum are a few 

 bands of sandstone, particularly one red band, which in some places 

 is about 2 feet thick. 



5. Grey sandstone, harder than No. 2 and 3 ; 2 feet. 



6. Greenish blue marly clay, rather paler than No. 4, and con- 

 taining a few beautiful crystals of pyrites ; 1 foot. 



If these green stripes are coloured by oxide of copper, these 

 crystals may be presumed to be copper pyrites. 



7. Red sandstone, forming the lowest part of the series here 

 displayed ; visible to the depth of about JO feet. 



The red strata are of a pale brick colour, very soft and marly in 

 many places, but in others hard and sandy. Some of the most sandy 

 specimens are highly schistose and micaceous. Thin masses, or 

 imperfect seams, of greenish or blueish clay, are found here and 

 there, imbedded in the red rock. 



On the south side of the ridge at Seaton, the strata dip rather 

 rapidly below the level of the sea; but on the north side, where there 

 are some breaks and irregular bends, the red sandstone continues for 

 a considerable distance along the shore; till, arriving at the com- 

 mencement of the submarine bog formerly mentioned (p. 30, 31, 35), 

 it recedes from the shore, and stretches out into the sea, forming 

 another ridge, covered at high water, near the entrance of the har- 

 bour of Hartlepool. In some parts of the shore, the sandstone has 

 a broken and mixed appearance, like breccia. 



Besides these spots, where this member of our strata reaches the 

 surface, we may notice others where it has been examined by boring. 



■2 T 



