1870.) SHARP—NORTHAMPTONSHIRE OOLITES. 379: 
- ; ft. in. ft. in. 
4, Soft marly bed, with Ostrea Sowerbyi abundant 1. ...ssccsecsseseceeee 1 O 
BD: Compact marly limestone .isc.cicccseesteconcsstecesoasceccsccddaveesenses 2 3 
6. Marly limestone, very soft, with Ostrea Sowerbyi, large Trigonia 
Moretoni, Modiola, and other Great-Oolite fossils ........0.0..2.080 1 3 
‘7. Dark-grey clay, with numerous Ostrea Sowerbyt........ccecucesscsssees 1 6 
8. Ironstone band, with Ostrea Sowerbyi, Modiola imbricata, Pteroperna 
plana, Perna rugosa, var. quadrata, Natica (Euspira) pyra- 
TUNE, COGS setcsvochsoctsueussecssssbieedssescoasaesebas sedensescags 09tol O 
9. Very variable sandy clay, sometimes more arenaceous than argilla- 
ceous, with vertical plant-markings ............s0s..eeeneeues 20to3: 0 
10. Orange sand, with nodules of ferruginous sandstone ................+ 3 0 
11. Course of compact rock, occasionally calcareous .........+..++ 10tol 38 
12. Compact rock, more ferruginous, and occasionally argillaceous...... TAG 
13. Ironstone beds—cellular ironstone, with ochreous, sandy, or green 
cores: towards the bottom the blocks are larger, and consist in 
the mass of green arenaceous material coated with iron-ore, as 
Ste USLOM! sekwessstitaelncsccccasueadecnsceteesseammeceseucszeee 10 0to12 0 
The beds, 2 to 6 are limestone of the Great Oolite, and are 
probably equivalent to the lower beds of the last section ; but, lying 
near the surface instead of low down as in the limestone quarry, 
they have been altered by atmospheric action. 
- In the General Section, these beds would be referred toA; 7 and 
8 would, I think, represent B; 9, with its plant-bed, C; 10, and 
perhaps 11, D; 12 may be considered perhaps debatable ground ; 
but 13 would doubtless be included in E. 
The fossils obtained in these ferruginous beds are all of kinds 
collected from the Duston Ironstone ; but the zones of Astarte elegans, 
corals, and plants, seem here to be wanting. 
The junction of the Ironstone beds with the Upper Lias is seen 
on the road-side at ¢e, well up on the hill between Blisworth and 
the railway station. 
At Gayton, about a mile to the west, ironstone is also largely dug, 
the beds having very much of the character of, and yielding nearly the 
same fossils, as those of Blisworth,—very fine Pygcster semisulcatus, 
Cidaris Fowler (confirmed by a fr2 ,nentary impression foznd by 
the late Dr. Berrill at the Northampton Asylum), very large casts 
of Ceromya bajociana and Isocardia (a new species), Plet;otomaria 
armata, Astarte rhomboidalis, Phil., and Hyboclypus ovalis, Wright, 
being noticeable. The overlying beds coasist of the same series a8 
in the other areas, but have been very much disturbed. The bottom 
bed of the limestone has yielded many large examples of [hyncho- 
nella concinna. 
[ Norz.—Since the reading of this Memoir before the Society, I 
have been favoured by a visit from Dr. Lycett, who examined the 
majority of the sections which I have described, and who obliged me 
with the fo'lowing written opinion as to the geological equivalency 
of the white-limestone beds of the district :— 
“The Great-Oolite beds of Kingsthorpe, Duston, and Bliswortix 
appear to me to correspond, both in their lithological character and 
included fossils, with the beds of Forest Marble to the eastward of 
Minchinhampton. The Pholadomye, the Cardia, the Bulle, the 
Corals are identical; and the association of these forms in the 
2D2 
