1870.] SHARP—NORTHAMPTONSHIRE OOLITES. 373 
and, in the aggregate, fall short by 3 feet of the measured depth of 
the well. 
A quarter of a mile north of this point, and a mile and three 
quarters from Duston “ Old” pit, in my own garden, at a lower 
level than y, the limestone bed overlying the slate bed (no. 5, a and 
b, of “Old” Duston) occurs; and below, but not immediately, is 
found cellular ironstone with ochreous cores. 
At a mile 8.E. of Hopping Hill, and at a little more than a mile 
west of. Northampton, in the angle formed by the junction of the 
roads to Weedon and Duston, is perhaps the most important iron- 
stone quarry in Northamptonshire. During the last eleven years 
the excavations, varying in depth from 25 to 35 feet, have been 
extended over an area of about 16 acres. (See z.) 
The whole section belongs to my division E, and consists of iron- 
stone of varying richness. I have noted the section some five times 
at various intervals, but have found no very great variation in the 
character and order of the different beds; and in this respect they 
offer a striking contrast to the D beds of Mr. Bass’s pit, the variation 
in which is so remarkable. 
These beds are very fertile in organic remains ; and, through the 
intelligent and watchful assiduity of Mr. Eldret, the overlooker of 
the works, I have been enabled to obtain from this quarry a large 
collection of fossils, upon the significance and importance of which 
it is needless, and would be out of place, for me to dilate. I have 
often paid my thanks to Mr. Eldret; and I think the thanks of 
geologists generally are due to him, but for whose active interest in 
the preservation of these fossils they would certainly have been 
consigned to the smelting-furnace, and thus lost to geological 
science. 
A great part of the area of excavation was the site of a Roman 
burial-ground; and, through the agency of the same Mr. Eldret, I 
have obtained many interesting Roman and Romano-British anti- 
quities, with which the surface-soil and underlying disturbed mate- 
rial abounded. 
The surface-soil is generally about three feet in thickness, but, 
from ancient disturbance, is frequently mixed up with the material 
of the upper bed of the ironstone—this disturbance having pene- 
trated to irregular depths, frequently of 6 feet. 
The following are the particulars of a recently exposed section :— 
Section of Ironstone at Duston Quarry. 
ft. in. 
1. Surface soil and rubbly ironstone, mixed by disturbance and very 
irregular, with zone of Cardium cognatum or Buckmani at bottom 6 O 
2. Stratified cellular ironstone with ochreous cores, in thin layers...... 3 0 
3. Ironstone, more sandy and very shelly, with large Nautilus (obesus), 
Ammonites Murchisone and A. corrugatus, Pholadomya fidicula, 
TOA OMERLC APTA, Pek ted visto saein nat acleb accent unenncadeseonsateosemntes 3 0 
4. Rich cellular ironstone with sandy cores—zone of Astarte elegans, 
Trigonie, Ceromye, and many other shells ...............eseeereeeeee UG) 
5. Bed in blocks of sandstone, oxidized upon joint and bedding planes 1 O 
6. Very rich cellular ironstone, containing many corals: from this bed 
