THE LIAS MARLSTONE OF LEICESTERSHIRE. 
G5 
fully 150 feet. In this neighbourhood, the Marlstone attains 
more than twice the thickness it exhibits in the Oakham 
district. In the vicinity of Tilton there are several interesting 
exposures of the Marlstone Hock. It is finely displayed in 
the railway cutting south of Tilton Station in its grey 
unweathered form beneath a thick capping of Upper Lias 
shales, and in this section its junction with the underlying 
Middle Lias shales is well shewn. 
Section in railway cuttiny south of Tilton Station. 
Ft. In. 
Upper Lias Shales, in grass-grown slopes, about ... 80 0 
Middle Lias: Marlstone Bock — 
(/*.) Bluisli-green calcareous ironstone, massively 
bedded with an irregular flakey capping con¬ 
taining Nautilus truncatus, Ammonites acu- 
tus (in great numbers), A. spinatus, A. com¬ 
munis, A Holandrei, A. serpentinus, A. 
annulatus, A. Ccecilia, Belemnites elongatus, 
B. paxillosus, B. apicicurvatus, Lima pec- 
tinoides, Pecten aequivalvis, Cerithium fer- 
reum, C. confusum, C. reticulatum, Eucyclus 
Gaudryanus, Pliasianella turbinata, Troclms 
ariel, T. aeolus, Cryptasnia expansa, Plicatula 
spinosa, Bliynchonella tetraedra var. 
Northamptonensis, Terebratula punctata, and 
var. and occasionally fragments of fossil 
wood ... ... ... ... 0 G to 0 9 
passing down into dark bluisli-green cal¬ 
careous ironstone finely oolitic, containing 
Am. communis, A. acutus, Pecten lunulans, 
P. aequivalvis, Terebratula punctata, Belem¬ 
nites ... ... ... ... ... 28 82 
{(j.) Grey finely oolitic calcareous ironstone, 
Pecten lunularis, Belemnites ... ... 1 7 
(/.) Encrinital bed, grey finely oolitic rock, 
obliquely laminated with encrinital frag¬ 
ments, Belemnites .. ... ... OG 10 
( 0 .) Bluisli-green oolitic rock, with irregular 
seams of encrinital fragments, Belemnites ... 1 2 
id.) Bluish-green finely oolitic rock, with encri- 
nite fragments, Pecten lunularis,P. aequivalvis 2 0 
(c.) Bluisli-green rock, becomes locally a “jack,” 
Pecten aequivalvis, Belemnites, Pthynclionella 
tetraedra, Terebratula punctata .. ... 1 G 
