MIDDLE CHALK—LINCOLNSHIRE. 
483 
and Louth. The chalk seen is white and tough, in massive beds 2 
ur 3 feet thick, with courses of grey flints ; it is quarried in two levels, 
and near the top of the lower one is a layer of grey clay; the beds 
below this layer are harder and grittier, i.e., more full of Inocera¬ 
mus shell, than those above, which are consequently the most 
suitable for the manufacture of whiting. 
The section in Mr. ClaphanTs quarry at Louth, showing some 
40 feet of this chalk, has been given on a previous page. West of 
Louth some of it is exposed again in a quarry half a mile west of 
Bunkers, and still further west the base of the zone with the usual 
“ columnar bed ” was observed in a small pit S.S.E. of the farm in 
Welsdale Bottom (Sheet 83.) 
Still farther north (within the limits of Sheet 86) the base of the 
zone, presenting similar features, is exposed in several pits near Roth- 
well, another half a mile south-east of Cabourn church, and again 
in one west of Swallow. 
Fig. 83.—Sketch in a chalk pit near Alford. 
a =seam of black flint. 6=seam of grey clay. 
West of Melton Ross there is a large quarry worked on both sides 
of the railway, and exposing some thickness of this chalk which 
is used for the manufacture of whiting. Mr. Hill informs me that 
it now shows about 60 feet of white chalk with grey flints, the 
upper part lying in thick, massive beds, the lower part in thinner 
beds with marly partings. The chalk is full of fragments of Inoce- 
ramus shell,and Inoceramus Guvieri is a common fossil; Rhyncho- 
nella Guvieri was also found, but he saw no Inoc . mytiloides, so that 
the whole appears to be above the zone characterised by that fossil. 
Another quarry half a mile north of Melton Ross was also visited 
by Mr. Hill in 1899, who reports it as showing about 20 feet of chalk 
with grey flints, less shelly than that at the Whiting Works, and 
probably in rather higher beds. He found an Inoc. Guvieri and a 
small Rhynchovella, 
4219, 
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