220 LIAS OF ENGLAND AND WALES : 
CHAPTER VIII, 
MIDDLE LIAS (continued'). 
LOCAL DETAIL?. 
Oxfordshire, Northamptonshire) and Warwickshire. 
PKOCEEDING along the AVindrush valley into Oxfordshire we find 
an inlier of Middle Lias along the borders of the Taynton brook ; 
and this points to some undulations accompanied by faulting of the 
strata. 
Prof. Hull observes that iu a quarry south of Daylesford, die 
Marlstone contains pebbles of slate and sandstone ; at Tangiey, 
north of Taynton, the higher beds of the Middle Lias are repre- 
sented by ferruginous sandstone with Belemnites, 10 to 20 feet 
thick ; and at Milton Field, S.W. of Shipton-urider-Wych- 
vvood, there is about 24 feet of Marlstone, brown sandstone, and 
sandy shale, resting on clays.* At Ascott-under-Wychwood, the 
upper beds of the Middle Lias were shown to a depth of 10 feet, 
South of Chadlington, to the west of Calsham Bridge, the 
Marlstone was proved by Mr. F. A. Bather to underlie 40 feet 
of Upper Lias. Prof. Hull remarks that at West End, near 
Chadlington, a bed of blue clay immediately underlies the Rock- 
bed ; while near Fawler it is underlaid by sands, with balls of 
concretionary iron-ore in the top bed. In the railway-cuttings 
between Fawler and Charlbury the Marlstone was nearly 10 feet 
thick.t 
In the valley of the Evenlode at Fawler, west of Stonesfield, 
the Marlstone has proved sufficiently rich in iron-ore to have 
been worked with profit. According to Prof. Hull, the average 
thickness of the bed is 6 feet, and it no doubt extends in a north- 
easterly direction to the neighbourhood of Adderbury and King's 
Sutton. Northwards " at Enstone the ore crops out in the valley, 
and as far as appearance is to be relied upon, there seems little 
difference between its qualities there and at the Evenlode 
valley/' J Westwards of Ascott the beds although " highly 
ferruginous " in places, are for the most part snndy in character ; 
and even west of Charlbury the rock-bed is not so ferruginous as 
to the east, and its thickness is less. 
The sections at Fawler showed, beneath the Upper Lias, about 
10 feet of oolitic ironstone, reddish-brown with greenish portions 
towards the base, with here and there clusters of Rhynchnnella 
tetrahedra and Terelraiula punctata. Beneath the Marlstone, 
about 11 feet of sands, and then blue clay with Ammonites 
margaritatus in the upper part (ns before mentioned, p. 158) were 
reached. 
* Hull, Geol. Cheltenham, pp. 20-23. 
t Geol. Woodstock, p. 10. 
t See Hull, Geol. Woodstock, pp. 10, 11. 
F. A. Bather, Quart. Journ. Geol. Soc., vol. xlii. p. 144; see also Hull, Geolo- 
gist, vol. iii. p. 304. 
