1870.] JUDD—NEOCOMIAN. 301 
The various sections obtained in the Acre-House Mine show that 
the thickness and order of succession of the different beds change 
very rapidly within short distances. The upcast shaft gave the fol- 
lowing section from above downwards :— 
- 
e 
5 
MID BS oll ieee were asec aerate a So tae clea alsnaiptleWiawlsbs aidaeenn sani sapamoste et 2 6 
(QUAN ilat techn alle Marian sess ts anislnsttcvebsieitaisia sin\aaslsiae Siep svslcstscree sh ees 9to 10 0 
(3) Beds of yellow clay and red marly chalk .....................02005 10 0 
(i Redliisam dlieeimanewae ken chiscivn neneuntamane Maes Use nabaea es sie encusthed ss 10 0 
(5) Limestone rock, hard- and blue-hearted ...................2:0eceeeee 14 0 
(6) Blue clay, with the same fossils as the limestone above (Pecten 
GTUOHIS @) OONNMEMID) a ancaabaseanon saosudde 5odacadne adoadaedboseasemacaneed 40 0 
(7) Ironstone, soft and earthy above, solid and finely oolitic below 
(only the lower. part is worked).................:.s000eseene- 13 to 14 0 
(8) Coarse greenish-white sands, in places indurated into hard sand- 
SLOME KOCK alsa wenia sey AeA NI ey AMUN ACE aN 6to 7 0 
(9) Very dark-coloured, highly bituminous, shaly clay. A thin bed 
at the top is remarkable for its highly inflammable character, 
and greatly resembles the Kimmeridge coal of the south of 
England. 
In this section, 3 evidently represents the Hunstanton Red-rock 
(Gault?); 4, the upper sands (Upper Neocomian ?); 5, 6, and 7, 
the Tealby series (Middle Neocomian); 8, the lower sand and sand- 
stone (Lower Neocomian ?); and 9, the top beds of the Kimmeridge 
Clay. 
The most interesting point about the above section is the great 
thickness of the clays 6, which in their mineralogical characters 
and fossil contents precisely resemble those of the Middle Neocomian 
at Speeton Cliff. As we proceed southwards the clays evidently be- 
come much thinner and subordinate to the limestones, while these 
last, on the other hand, are very extensively developed*. 
TV. Genyerat Sxercu or tar Neocomran Bups or tHE Norte oF 
ENGLAND. 
The most striking and remarkable circumstance in connexion with 
the stratigraphical position of the beds of Mesozoic age in Yorkshire 
and Lincolnshire, and that which it is always necessary to bear in 
mind in reasoning on their relations, is the grand unconformity 
which exists between the Cretaceous and Neocomian series (see 
section, fig. 2, and Table, p.cd1*. In consequence of this the chalk 
beds overlap all the Neocomian and Jurassic beds in succession quite 
down to the Lower Lias. Thus the Hunstanton Red-rock (the base 
of the Upper Cretaceous) is found lying in succession on Upper Neo- 
comian at Speeton, on Lower Neocomian at West Heslerton, on 
Portlandian (?) at Knapton, on Kimmeridge clay at North Grimston, 
on Coralline Oolite at Leavening, and on Inferior Oolite at South 
sand, each of which is coated with peroxide of iron, while the grains of the Lin- 
colnshire and German ores are almost entirely made up of concentric coats of 
the last-mentioned substance. 
* For much information concerning these Lincolnshire ores I am indebted 
to W. Firth, Esq., of Leeds, the Managing Director of the Yorkshire Coal and 
Tron Company. 
24a 2 
