LOWER CHALK. 135 



XII. 



^ II. 7. LOWER CHALK. 



XIIL 



§ II. 8. UPPER, OR FLINTY CHALK. 



These deposits form by far the most considerable and important di- 

 visions of the chalk formation, and constitute the most striking features 

 of the geology of Sussex. As their investigation is highly interesting, we 

 shall endeavour to elucidate the subject, by subjoining a brief notice of 

 the course of the chalk through the south-eastern part of England, and 

 on the Continent, 



We are informed by Mr. Townsend, « that the chalk hills are bounded 

 by a Une which stretches from south-west to north-east, and that within 

 these hmits they form three principal mountain ranges. The first, leaving 

 Berks, runs north through Bucks, Bedfordshire, and Hertfordshire, into 

 Cambridgeshire, by Dunstal^le, Hitching, Baldock, and Royston, to Gog- 

 magog Hills, near Cambridge. The second, passing from Berkshire east- 

 ward, stretches through Surrey, where it forms the Hog's back, that beau- 

 tiful ridge which extends from Farnham to Guildford, and then appears 

 at Boxhill. I'his branch forms the hilly country and the downs north of 

 Reigate, Bletchingley, and Godstone. It enters Kent to the north of 

 Westerham, and extends by Riverhead, to ^Vrotham, south of Hartford, 

 Rochester, Lenham, and Canterbury, to I'olkestone and Dover. One di- 

 vision of this ridge is continued to the north coast of Kent, by Fevers- 

 ham, near Sheppey, Margate, and North Foreland to Ramsgate. 



