138 
WEYBOURN CRAG, 
At Trimingham, on the shore due north of the village, one of 
the most important sections showing the relation of the Ohilles- 
ford Clay to the Weyhourn Crag was seen. The Weybourn 
Crag would here normally be almost entirely below the level of 
low-water, but some years since the weight o£ a large landslip 
from the cliffs forced the beds into an arch, and enabled me for a 
short time to examine the lower part of the section. Owing to 
the disturbance there is a little doubt as to the exact thickness of 
the lower beds :— 
Feet. 
Forest-bed. Carbonaceons clays witb lignite, &c. 
fLaminated green and blue micaceous and\ , 
I rather carbonaceous clay - - - / 
Weybourii Crag <( Gtreen loamy sand full of marine shells and \ o 
I containing teeth of Arvicola intermecUus - J 
[ Laminated greenish clay as above - - 4 
Here there is a mass of laminated micaceous clay, in the middle 
of which is found a shelly sand full of the common Wey bourn 
Crag shells. The species found were:— 
Buccinum undatum. 
Littorina littorea. 
IsTatica catena. 
Pleurotoma turricula. 
Purpura lapillus. 
Trophon antiquus, reversed var. 
Turritella terebra. 
Astarte borealis. 
-- compressa. 
- sulcata. 
Cardium edule. 
Corbula contracta P 
--— gibba. 
Cyprina islandica. 
Leda oblongoides. 
Lucina borealis. 
Mactra ovalis. 
Mya arenaria. 
-truncata. 
Mytilus edulis. 
Nucula Cobboldia3. 
Pholas crispata. 
Saxicava arctica. 
Tellina balthica. 
-lata. 
-obliqua. 
Fig. 33. 
Tellina balthica, Linn. 
Natural size. 
The Crag is exceptionally fossiliferous, but owing to its in¬ 
convenient position can seldom be examined. During the last ten 
years I have only once (in October 1889) 
been again able to examine it, though 
the stronger shells are still washed up 
after storms. Tellina balthica (Fig. 33) 
is perhaps the most abundant fossil. 
The Trimingham section just des¬ 
cribed is only three miles from the 
boring at Mundesley, but, owing to the 
accumulation of beach, I have not yet 
been able to examine the strata beneath 
the Forest-bed in the intervening area. 
It is here, if anywhere, that the relation 
of the Wey bourn Crag to the Chillesford Clay must be made 
out, for the deposit at Trimingham is undoubtedly Wey bourn 
Crag, and that at Mundesley seems decidedly to be Chillesford 
Clay. According to Prof. Prestwich, who correlates the Wey- 
uourn Crag with the Norwich Crag, we ought to find the 
Weybourn Crag to pass beneath the Chillesford Clay; according 
to S. y. Wood, jun., we ought to find it above that Clay, and 
alternating with the Glacial deposits. The most probable view 
