LOWER CHALK—DEVONSHIRE. 
127 
of the chalk, near Sutton and Widworthy, a stone, called Grizzle 
by the quarrymen, is dug in the situation of the firestone. The 
beds are altogether about 5 feet in thickness. It contains green 
particles, and does not burn to lime. Among its fossils is Gatillus 
Guvieri ”* The position of this quarry is shown on the map, Fig. 30 ; 
the greater part of it is overgrown, but a weathered exposure of 
the grizzle can still be seen. The fossil mentioned by Fitton is 
doubtless Inoceramus striatus, good specimens of which can be 
obtained from the exposures now open at Wilmington, which lies 
to the north of the old Sutton quarries, (see Fig. 30.) 
At Wilmington there are two sand-pits opened in the zone of 
Ammonites Mantelli, for though the rock is a hard calcareous grit 
when covered by some thickness of chalk, it is otherwise where it 
crops out to the surface, being so decalcified and decomposed that 
most of it can be easily removed by pick and shovel. The coarse 
sand so obtained is valued for rough-casting, and for other purposes. 
Fig 31. —Sketch of the Quarry north-east of Wilmington. 
The pit in a field to the north-east of Wilmington, near the lane 
to Hayne Farm, shows the junction of the calcareous sand¬ 
stone with the overlying Middle Chalk, and the following 
succession was observed in 1897 : — 
ft. in. 
* <s> 
"-4-I <50 
° s 
O 
S3 
Vegetable soil and flints. 
5. Soft bedded white chalk, up to - 
4. Rubbly glauconitic chalk with scattered quartz 
grains, and a layer of very hard chalk with green- 
coated nodules at the top, Inoc. mytiloides - 
3. Soft glauconitic marly chalk - - 
2. Hard glauconitic and quartziferous limestone, with 
a worn and phosphatised surface at top, but the 
base not well marked ; some fossils ; about 
1. Rough yellowish calcareous sandstone with many 
fossils, weathering into sand with lumps and 
blocks of sandstone ------ 
2 6 
2 6 
0 9 
2 0 
6 0 
The above measurement was taken on the downthrow side of 
the fault, shown in Figure 31. On the upthrow side the rough 
upper part of the sandstone la}^ just below the soil, so that the 
throw of the fault cannot be more than 9 or 10 feet. 
* 
Trails. Geoh Soc., Sei\ 2, Voi. iv. p. 234, 1836. 
