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OF LINCOLNSHIRE NEOCOMIAN.
241
when the bed is hard

and if soft, the test is usually dissolved, and
only a mould remains.
The junction of the lower sands with the Kimmeridge Clay was
also well seen in a cutting a few hundred yards E. of S. Willing-
ham station (fig. 2). Here the greenish sands, where they lie on
the flaggy Kimmeridge shales, contain at their base a line of phos-
phatic nodules.
Fig, 2. — Diagram of Railway -cutting, E. of S. Willingham Station.
a. Kimmeridge Clay. b. Line of Septaria. c. Line of phospkatic nodules in
d. Lower Sands, e. Surface soil.
. In the memoir referred to, it is suggested (I. c. p. 248) that about
Market Rasen the lower sand and sandstone formed extensive
rabbit-warrens and fir plantations, some of which have been
brought into cultivation. We are however of opinion that these
tracts are covered by a sand of quite a different description, viz. a
member of the drift series

we think a consideration of the level
up to which the Kimmeridge Clay occurs above the valley — over
200 feet, will make this apparent; moreover the last-mentioned
sands differ lithologically in a marked manner from the JSTeocomian
sands.
These lower sands in the excavations near Claxby are 24 feet
thick. The fossils obtained from them are the following

— Belem-
nites, sp. , Ammonites Koenigi, Sow., A. plicomphalus, Sow., and
others

species of Ohemnitzia, Phasianella, Pleurotomaria, Trochus,
Crepidula, Pileopsis, and Natica

Peeten Cottaldinus, d'Orb., P. or-
bicularis, Sow., Cucullaio, donningtonensis, Keep., MSS., Cardium
subhillanum, Leym., Trigonia Keepingi, Lye, T. tealbyensis, Lye,
T. ingens, Lye.

species of Inoceramus, Avicula, Area, Tellina,
Lucina, Cythercea, Thetis, Astarte, Myacites, Pholadomya, LitJio-
domus, &c.
Above them is the iron-ore (fig. 1, b), an argillaceous ironshot
limestone, i. e. full of dark-brown oolitic grains of iron oxide,
with some streaks nearly all clay and devoid of the iron grains.
This set of beds is 9-10 feet thick, and may be followed in the
escarpment all the way from the north or Nettleton end of the
ridge.
The two terraces of the escarpment formed by the harder beds
are a marked physical feature of this ridge.
The fossils of the Ironstone differ somewhat considerably from
those of the clays and limestone above, and are much more
numerous. They are included by Prof. Judd in his " Tealby Series."
The following is a list of them

— Belemnites lateralis, Phil.,