File:The Quarterly journal of the Geological Society of London (13859821505).jpg

OF LINCOLNSHIRE NEOCOMIAN.
243
On the Lincoln and Louth railway is a cutting (fig. 3), near
Benniworth-Haven House, which shows a thickness of 20 feet of
sands, surmounted by the Ironstone about 9 feet in thickness.
From the latter I have obtained a richer suite of fossils than from
anywhere else in the district

they are not equally fine throughout
the deposit, but are best preserved in a seam near the base.
Fig. 3. — Sketch of Benniworth-Haven Cutting.
a. Lower Sands.
b. Ironstone.
c. Soil with flints from the drift.
For the accompanying sketch of Benniworth-Haven cutting I am
indebted to Mr. "W. Keeping, M.A. Three divisions of the ironstone
may be noted, viz.

— (1) the better bed as described

(2) lighter-
coloured, more argillaceous, and with cuboidal fracture

(3) brown
crumbling stone.
The Upper Sands are usually said to be unfossiliferous

we have
been also unsuccessful in finding fossils therein, except in the phos-
phatide nodules

these are fragmentary, probably derived, and
scarcely specifically determinable. The following genera, however,
occur — Ammonites, Pleurotomaria, Requienia ?, Modiola, Oyprina ?,
Myacites, Pholadomya ?, and Pholadidea. Lithologically, these no-
dules agree exactly with those from the Neocomian beds of the
Bedford and Cambridgeshire area.
The Upper Sands are well seen in the cutting at the west end of
"Withcall tunnel (fig. 4).
Fig. 4.— Sketch of Cutting at West End of Withcall Tunnel
a. Brownish and reddish-brown sands. b. Band of phosphatic nodules.
c. Line of ferruginous concretions. d. Eed Chalk, 9 feet.
e. Greyish-white chalk, 8 to 15 feet above the tunnel.
/. Bearranged red and white chalk.
Fully 30 feet of the Upper Sands are here exposed

they are