CRETACEOTJS SERIES IN LINCOLNSHIRE AND YORKSHIRE. 353 



Belemnite-marls ; the two latter, although not so common as in the 

 South, I found in either county in most of the larger exposures. 



The Coloured Bands. 



Bands of bright red or pinkish colour forming so marked a contrast 

 to the white Chalk have long attracted the attention of geologists in 

 Lincolnshire and Yorkshire. In the former county, besides the Hun- 

 stanton Limestone, too well known to call for further remark, two 

 bands occur, both of which are in the Grey Chalk. The lower of 

 these, about 7 feet thick, occurs about 3 or 4 feet above the " Grey 

 Bed," and is darker and perhaps on the whole more uniform in its tint 

 of bright reddish pink than the upper, which is of the same thickness 

 and occurs in the extreme upper part of the Grey Chalk, the colour 

 extending to the Belemnite-marls. Neither band is continuous, 

 and they are seen only in central Lincolnshire for a distance of about 

 16 miles. 



In Yorkshire the colour of the Hunstanton Limestone varies. In 

 the cuttings east of South Cave Station a greyish-white band about 

 18 inches thick occupies its central part, and at Wharram Grange 

 exposure the colour, as before noted, is yellowish with darker 

 stainings. At Speeton, lines of grevish-white nodules occur in the 

 Bed Chalk. 



Throughout the county traces of a pale pink-coloured band, seen 

 in two or three places to be about 4 feet thick, are constantly found 

 in the Grey Chalk, occupying a horizon analogous to the position 

 of the lower band in Lincolnshire ; but no trace of coloration is seen 

 at the horizon of the Belemnite-marls. 



The Lower Chalk of the Speeton Cliffs is strongly marked by 

 bands of colour, the lowest of which occurs about 10 feet above the 

 Hunstanton Limestone. The base of this bed, which is of a dull 

 brick-red, forms an undulating line which does not coincide with 

 the plane of stratification, a fact already noted by Prof. J. F. Blake*. 



The deep red colour which pervades the chalk for about 8 feet 

 appears to die away above this, and it is the marl only, separating 

 the potato-like lumps of which the chalk is composed at this horizon, 

 that is coloured red or rather pinkish purple. The nodules them- 

 selves, faintly coloured pink throughout, weather greyish white at 

 those portions most remote from the marl, the tint deepening gradually 

 to the point of contact with it. The colour of the upper part of the 

 lowest red band does not retain the same depth of tint for a great 

 distance laterally, and it fades away upward in an uncertain manner, 

 rather difficult to describe, until the blue or grey colour of the marl 

 predominates. The thickness of the whole of this colour-band is 

 about 18 feet. About 7 feet above it, the marl separating the nodules 

 again becomes tinted a pinkish purple, and the nodules faintly so 

 for a thickness of 3 ft. ; this forms the middle pink band noticed by 

 Prof. T. Wiltshire, Prof. J". F. Blake, and others. These beds, which 

 form the base of the cliff near " Nanny Goat's House," pass beneath 

 the shingle of the beach and are not seen again. 



* Proc. Greol. Assoc, vol. v. p. 240. 



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