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PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 17, 



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ft. in. 

 Cornbrash above. 

 Pale clay, with some root-like masses resting on dark 



shaly clay 5 



Thin skerry sandstone 4 



Pale clays 3 ft. to 6 6 



Skerry sandstone and shale, changing to solid sand- 

 stone 1 ft. to 6 



Shale, darkens at the bottom 14 



White sandstone — " pipy " — with two thin partings... 5 6 



Shale, growing dark at the bottom 6 



Pale blue shale and laminated white sandstone (in one 



place ironstone) 8 



Alternations of pale bluish and purplish shaly clay ... 9 



Thin sandstone "J 



Series of pale bluish and purplish shaly clays, with I 29 6 



bands of nodules of granular iron-ore J 



Variable grits and shales 8 



Variable sandstones, with layers of wood, the top very 



irony ; it is unconformed on the beds below... 12 ft. to 20 

 Pale clays, with a band of jet and some lumps of iron- 

 stone at the bottom 4 











The thicknesses are all variable in a short distance, and the beds 

 of sandstone vary in quality in a few yards. 



On the north side of the island, the lower part of this series, be- 

 low the granular iron-ore bands, appears as under : — 



ft. in. 



Sandstone 4 



Shale 5 



Sandstones, with shale partings 5 



Sandstones and shales, in wedge-like alternations ; the lowest 



shale very dark 16ft. to 21 



Irregular sandstone, with partings of shale and layers of wood, 



in the state of jet or coal 12 



This rests unconformedly on the subjacent series, e 2. 



In the whole of this series, no special plant-bed has been recog- 

 nized in the Gristhorp section, nor have any shells been seen there. 

 North of Scarborough, Cycadaceous leaflets occur in a brown iron- 

 stone about 40 feet below Cornbrash, and at Scalby Beck is a layer 

 of the leaves which I called Sphcenopteris latifolia (Geol. of York- 

 shire, ed. 1. p. 148, pi. 7. fig. 18). 



e 2. — The beds thus designated are only seen in a complete state 

 on the south side of the island at Gristhorp ; on the north side of 

 the island the top was removed by denudation before the lowest beds 

 of e 3 were deposited. 



Section of the series of subcalcareous and ferruginous beds (e 2), 

 some of them yielding marine shells, in Gristhorp Bay, south of the 

 island : — 



ft. in. 

 ' Hard sandy bed, irony at top, with decomposing bisul- 



phuret of iron and some jet 1 3 



Grey streaky sandstone, with some decomposing bisul- 



phuret , 2 



Brown laminated, partly ferruginous, bed 2 



Grey sandy shales, sulphureous 2 



Ironstone-balls in a band (Avicula Braamburiensis) 1 



Subcalcareous, partly shelly, bed 2 



Ironstone-balls in a band 



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