NOTES AND QUIClUK; 
41 
are wiiler in limestone than in siliceous strata. By acquired information of the 
numerous examples at Alston JVIoor in Oumlierlanrl, at the two Allendales in 
Morthumherland, and at Wcardalc in Durham, coupled with my own observations, 
I do not hesitate to say that the (ptantity of iron in veins in siliceous strata is but 
small in comparison to the quantity in the same veins where they cut through 
limestone. Not only is this the case in the localities quoted, but in the adjoining 
mines of Teesdale the veip.s also seem to be of a more ferruginous nature in the 
limestone than in the sandstone. The most noticeable stratum is that designated 
the ' great limestone.' Nearly three fixthoms from the top of this limestone is an 
argillaceous bed, called the 'black-bed,' al)out a foot thick. In three places of 
the ' great limestone,' some veins mineralize for several fathoms horizontally. 
These horizontal mineralizations are designated ' fiats.' The distance from the 
toj) flat, which occurs about four feet below the ' black bed,' is near two fathoms, 
and from tlie middle flat to the lower one rather more than two fiithoms. The heights 
of these flats and their distances from the vein-fissure, which mineralizes them, 
vary consideral)ly, and seem to be nuich influenced by the proximity of metalliferous 
'strings' and of other veins. In some cases where there is a complication made 
by numerous crossings of veins, the flats will unite and form one mineral mass 
through the compact body of the limestone nearly up to the ' black-bed.' Ores of iron 
and lead are the chief metallic deposits. In Weardale a company is now working 
the lead-ore veins for iron, in the flats and at the intersections. The iron is 
obtained both by mining and from open cuttings ; the latter affording favourable 
ojjportunities for observation, and such is the extent of the workino;s that hundreds 
of tons are sent away daily to the blast-furnaces. A siliceous bed lies close to the 
bottom of the limestone and other two not far above it ; the barrenness of these in 
feiTuginous matter contrasts strongly with the repletion of such matter in the 
limestone. It may be remarked that these siliceous beds al)ove the limestone have 
yielded in the veins small quantities of crystallized carbonate of iron. The iron is 
also scanty in the veins in those siliceous strata more remote from the limestone. 
I am aware that veins in granite and siliceous schists do contain a considerable 
portion of iron, yet, I am disposed to think that the same veins might hold more 
in limestone, if such were present. In testing the soundness of the query, it is 
but foir to take veins cutting through limestone and siliceous strata, and, noting 
the thickness of each to draw thence a comparison with the contained quantities 
of iron. If the above examples are not satisfactorily sufficient for the solution of 
the question, perhaps other local observers, who have had experience of such 
phenomena, would be willing to give their testimony and evidence. Your cor- 
respondent states, that the presence of iron materially influences the productive- 
ness of other valuable ores. The limestone which has just been described as 
being rich in iron in the veins and flats, has also been exceedingly prolific of lead- 
ore. — Yours, &c., J. C." 
Igdanodon Remains at Atherfield, Isle of Wight. — "The remains of an 
Iguanodon have been discovered high up in the Lower Greensand de))Osits of 
Atherfield, — namely, in the sands of Cliff' End. The whole of tire skull with teeth 
was found ; but, owing to the friable state of the remains, the manner in 
which they were imiiedded, and the inqiatience and unskilfulness of the finders, 
they were got out piecemeal ; many of the teeth had- been sold before I heard of 
the discovery. I have, however, secured about a dozen, as also some fragments 
of the jaws and skull. The remainder of the skeleton is in the possession of the 
discoverer. — Yours, &c. Mark W. Norman, Ventnor." 
Dura Den — Yellow Sandstone and Fossil Fishes. — The Rev. Dr. Ander- 
son, of Newbm'gh, has again been in this celeiirated locality, now of world-wide 
fame, and tells us he has seen more fishes taken out of the solid rock than he ever 
had an opportunity of seeing in any drag-net at any one time from the waters of 
the teeming ocean. A few workmen were engaged, and in the course of a day or 
two there were laid on the green sward of this lovely dell upwards of five hundred 
fossil fishes, raised from their marble sarcophagi— in which they have been inten-ed 
for ages — all bright and fresh as the living things of yesterday. One of the slabs, 
about five feet S(piare, contained nearly a hundred specimens projecting in bold 
relief from the surface, most of them without a scale displaced, or an organ dis- 
