GALT, OR FOLKSTONE MARL. 
i6d 
FUCOIDES TARGIONII, FROM NEAR BIGNOR. 
5 . GALT*, OR FOLKSTONE MARL. BLUE CHALK 
MARL. 
A bed of stiff marl, varying in colour from a 
light grey to a dark bine, and abounding in am- 
monites, nautili, and other marine shells, succeeds 
the firestone, emerging from beneath the northern 
edge of that deposit where the latter is visible, and 
forming the base of the chalk marl where the fire- 
stone is absent. It generally constitutes a valley 
within the central edge of the chalk of Sussex, 
Hampshire, Surrey, and Kent, and may be traced, 
with but little interruption, from Southbourn, 
through Laughton, Ringmer, Plumpton, New- 
Timber, Steyning, Bignor, &c. in Sussex, to Folk- 
stone in Kent, near which town it forms a cliffj ce- 
* Gal/., or gaidt, a provincial term used in Cambridgeshire: it is 
employed by geologists from its not being so likely to mislead, as a 
name derived from the colour, or chemical and mineralogical character, 
of a deposit ; since those characters may vary in different localities, or 
he e(]iiall}' applic.able to some other formation. 
