482 
THE CRETACEOUS ROCKS OF BRITAIN. 
The first of these, exposing the base of the zone, is situate about 
a quarter-mile west of Ulceby, near Alford, and shows : — 
Terebra- 
tulinci 
Zone. 
White chalk in rather thick beds with*four layers 
of grey hints and a layer of rubbly chalk at the 
base --------- 
Thin-bedded chalk with scattered hints - 
White chalk in thin beds with a layer of grey hints - 
near the base - . 
Hard chalk jointed vertically and breaking into 
columnar fragments (Columnar bed see p. ). 
Zone of Rhynchonella Cuvieri .—Hard grey chalk weather- 
feet. 
22 
8 
oi 
^2 
04 
mg 
into shale 
Higher beds come in to the east of Ulceby along the eastern border 
of the Wolds (here very narrow) by Well, Rigsby, and Haugh. 
They are exposed in a quarry north-west of Wellchurch, which is 
about 27 feet deep, and from which Inoceramus Cuvieri and 
a small round variety of Rhynchonella Cuvieri have been obtained. 
A still deeper section is shown in the large quarry by the main road, 
about a mile W.S.W. of Alford railway station. In this the following 
beds are seen 
feet. 
Soil and chalk rubble.2 
Broken chalk, with a layer of grey hints 3 
White chalk, rather soft, in thick beds, with scattered 
elongate hints . ..8 
Layer of dark-grey marly clay. 
Massive white chalk with a layer of large hints 6 
Harder white chalk in three beds, no hints 5 
Layer of dark clay resting on an uneven iron-stained 
surface. 
White chalk in three beds, with scattered hints 6 
Thin continuous seam of hint, nearly black. 
White chalk evenly bedded with a layer of large nodular 
hints --------- seen for 7 
37 
The beds dip at 4° or 5° to the westward. There are several small 
displacements rendered conspicuous by the interruption of the layers 
of clay and flint, as indicated in Fig. 83, which represents part of the 
northern face where a small trough fault is seen. Fossils are very 
scarce. 
There are two quarries near Haugh in beds which are probably 
rather lower, and have yielded Inoceramus Cuvieri and Rhyncho¬ 
nella Cuvieri. Other pits exist near Belleau, Muckton, and Caw- 
thorpe, the last being more than 40 feet deep, and showing 4 or 5 
layers of grey hints. The base of the zone, resting on that of Rhynch - 
Cuvieri , can be seen in a pit half a mile south-west of Cawthorpe, and 
in another by the side of the main road to Louth, about a mile west 
of the same village, and again in a pit 3 furlongs S.S.W. of Tathwell. 
The chalk of the Terebratulina zone is quarried for manufacture 
into whiting at the place called “ Saturday Pits ” between Cawthorpe 
