LOWER CHALK—NORFOLK. 
218 
Mr. Whitaker also observed that the large disused quarry to the 
west, on the other side of the lane, is in hard grey chalk. The 
lowest chalk seen in it was hard and gritty, and when a sample 
was sliced and examined by Mr. Hill under the microscope it proved 
to contain glauconite grains. Probably, therefore, it is close to, 
if not actually, the top of the Totternhoe Stone. 
The highest beds are again seen at Hillington, the lower part of 
the pit showing the following section : — 
ft. 
Whitish thin-bedded chalk (? Melbourn Kock) - - 4\ 
Thin band of yellowish marl C? Bel. marl) - 
Hard massive whitish chalk ------- 4 
Bedded chalk, dull white, with greyer beds at intervals, 
Holaster subglobosus and Discoidea cylindrica - - - 10 
The lower beds clearly belong to the Lower Chalk, and it seems 
probable that the thin band of marl represents the zone of Act. 
plenus here on the point of thinning out. 
The lower part of the H. subglobosus zone is seen at Dersingham, 
and the central part in a pit at Ingoldsthorpe, but the whole of it 
is exposed in the two quarries at Heacliam, where the following 
beds are shown : — 
Upper Pit. 
ft. 
Weathered chalk and Melbourn Kock 9 
Hard thin-bedded whitish chalk, with a marly band 
about a foot from the top ------ 6 
Lower Pit. 
Thin-bedded whitish chalk, becoming greyer and thicker 
bedded towards the base ------ 30 
Totternhoe Stone—darker grey chalk,with green-coated 
nodules at the base -------- 2 
Hard cream-white chalk ----- seen f or 12 
Here, therefore, there is only 36 feet of chalk between the Tottern¬ 
hoe Stone and the Melbourn Kock, and there is nothing to represent 
the marl beds of the Act. plenus zone. 
At Hunstanton only 9 or 10 feet of thin-bedded greyish chalk 
are seen above the Totternhoe Stone (see Fig. 50), the higher part 
of this zone not coming into the cliff. 
List of Fossils from the Lower Chalk of Norfolk. 
This list is compiled from the joint paper by Mr. Hill and myself, 
published in the Quart. Journ. Geol. Soc., Vol. xliii. p. 544 (1887) and 
from that in the Survey Memoir 011 the Geology of the Borders of 
the Wash (1899). The letter s signifies that the species was found 
at Stoke Ferry or at places to the southward; n=places between 
Stoke Ferry and Hunstanton; and h=Hunstanton cliff. 
4219. p 2 
