372 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [ Mar. 9, 
valley, at the borders the Upper Lias, over the main-flat the Mid- 
dle Lias, and in a narrow central band the Lower Lias, are in suc- 
cession the surface-beds,) is a pit in the division D. The section here 
is about 30 feet in elevation, and consists entirely of white sand and 
sandstone, in which no fossils have been found. Some of the lower 
beds of this section are seen in the low side-section to pass into 
slightly ferruginous sandstone, some fractured surfaces of which, 
when held in one direction towards the light, present a peculiar 
lustre, proceeding from innumerable minute facets of crystals of 
carbonate of lime. 
To return to the neighbourhood of Hopping Hill—upon the Dal- 
lington side of the valley and brook already referred to, is an old 
stone-pit at x, which presents a section of about 25 feet elevation, 
consisting entirely of compact brown sandstone, in seven or eight 
beds, yielding no fossils—precisely the material of the white sand- 
stone of w, plus the ferruginous colouring. 
Again, at y, three-quarters of a mile 8.E. of Hopping Hill, is a 
recently opened pit, just showing at one extremity the White Sand 
C, and beneath this the following section :— 
Section of Pit on the Dallington and Duston Road. 
ft. 
1. Coarse sand (decomposed sandstone?) ...............+. 1 
Ps Gray lOO SENG IS HONIG) S) pesaododedasoseqadens0osbocedecndede 6 
3. Flagey sandstone, slightly calcareous ..................... 4 
4, Sandstone in beds of from a few inches to two feet 
THICKNESS fo. crcseesaneeasks/geeceReeeessacuR nam seeer 7to8 
All brown from ferruginous colouring—no fossils. 
At afew yards from this spot, and at nearly the same surface- 
level, two wells have been sunk through 68 feet, by admeasurement, 
of ferruginous rock, without dipping into the Upper Lias. In these 
wells, at some depth below the base of the above pit, the Astarte- 
elegans zone was penetrated. 
I have obtained from the well-sinker the following rough state- 
ment of the section of these wells :— 
Section of Wells at Duston. 
About 
fit 
Le sRedicrammellzarandesandits-sssn-s-cee secre recs seer eeeeeececeeeces 14 
OMRedwRocks tevariousibed sires) sere ee eceeeccee see eeeaamect Taser ser 14 
[From some materials which I obtained when the well was 
sunk, I assume that the zones of limestone and slate occur in 
these beds. ] 
. Red Rock, in three courses, very full of fossils..................... 7 
[The Astarte zone, of which I obtained a large block, occurs in 
one of these courses. | 
we) 
4,. Red) Hreestone? ss -\-.essaee aes eeemarceesoe seeders: semen cocoon 14 
0. Tronstone i sceee eeece eee een eee eee eee eee see ene ene eee 8 
6. Green Rock [‘ like the lower beds of Duston Ironstone”’]...... 8 
_ The Green Rock was not bottomed, plenty of water being ob- 
tainable, but forms the flooring of the well. 
The above thicknesses were only estimated by the well-sinker, 
