LOW Eft CHALK—WEST DOftsET. 
Ill 
Lower 
Chalk. 
Selbor- 
nian. 
{ Glauconitic chalk with scattered bits of brown 
phosphate . 
Layer of phosphatic nodules and fossils 
r Phosphatic conglomerate, consisting of dark 
brown phosphatic nodules in a hard, cal¬ 
careous, sandy matrix. 
Hard calcareous glauconitic sandstone 
Light grey glauconitic sand 
-Dark green glauconitic sand, seen for 
ft 
0 
0 
1 
3 
0 
10 
in. 
9 
3 
0 
0 
6 
0 
15 6 
The phosphatic conglomerate contains many fossils such as 
large Pecten [ Neitkea ] quddricostatus, Pecten asper, Ostrea 
frons, and Rkynchonella dimidiata, which retain their shells, and 
others, such as Am. [ Hoplites ] Studerl, Turrilites puzosianus , 
and Gucullcea obesa , which are phosphatic casts. 
The overlying nodule-bed contains two kinds of phosphatic 
nodules; some are greenish and appear to be phosphatised 
pebbles of calcareous sandstone, others are of the usual light 
brown, phosphatic, chalky limestone, and among the latter are 
the following casts of fossils : Am. [ScJdoenbackia] varians, Tur- 
rHites costatus, Tut. Wiesti, Cucullaa mailleana , and Holaster 
subglobosus var. alius, none of which occur in the underlying- 
conglomerate ; Plicatula inflat a, Rkynchonella mantelliana, 
and Micrabacia coronida also occur. 
At Bookham Farm, two and a half miles north-west of the 
section above described, is another clear exposure, where about 
5 feet of chalk rests on an eroded surface of the phosphatic 
conglomerate; but here there is no basal nodule-bed, only an 
inch or so of sandy glauconitic chalk, with a few scattered 
phosphates and Am. [ Sckloenbachia ] varians, passing up into 
less sandy chalk, in which I found Holaster subglobosus and 
a few bits of phosphate A similar facies of the basement bed 
can be seen in the quarry on Dogbury Hill, north of Minterne. 
To the southward, however, near Cerne, a thin nodule-bed is 
again found resting on hard, rough, glauconitic sandstone, the 
phosphatic conglomerate having thinned out, or having been 
destroyed by current-erosion before the deposition of the base¬ 
ment bed of the Chalk. The junction can be seen in the bank of 
the lane north-west of the Abbey Farm. About 2-J- feet of the 
glauconitic chalk are exposed, the upper portion with only a 
few green grains passing down into greenish glauconitic chalk 
with a few phosphates and a thin layer of nodules and fossils 
at the base, resting on an irregular surface of the calcareous sand¬ 
stone and filling also open cracks in the same. Lumps of sandstone 
can be obtained, the sides of which are covered with small Serpulae. 
At Batcombe and Evershot there is a still more conspicuous 
nodule-bed, and many fossils have been obtained from a quarry in 
Rocks Lane, north-east of Evershot. 
Passing down the valley of the Frome, an excellent exposure 
of the junction of Chalk and Greensand can be seen in quarry in 
