THE CLEVELAND IRONSTONE. 
J. J. BURTON, F.G:S. 
(PLATES VIII., IX. AND X.). 
(Continued from page 168). 
In some cases the accompanying diagrams are based on 
the Geological Survey measurements, in others the Survey 
records have been corrected in the light of more recent ob- 
servations, and in several instances they are the result of in- 
formation given to me by mines’ managers, or recently taken 
by myself. 
In the section of the main seam af ironstone at Eston (A), 
the Main and Pecten seams, although divided by a line, 
are continuous in section, that is, there is no shale parting 
between them; but in the section to the east, at Court Green 
(B) less than two miles away, these two seams have become 
separated by a band of Dogger and a band of shale. In an 
eastward direction, as depicted on successive diagrams, the 
shale band thickens, not on any very clearly defined principle, 
but in a somewhat irregular manner, until finally the Pecten 
séam becomes so split up into thin bands of shale and ferru- 
ginous material that it is impossible to define its upper and 
lower boundaries with any certainty. 
Without dealing with the subject in any commercial sense 
it is noteworthy that just where the Ironstone seam was first 
opened out on an industrial scale, the bed is not merely the 
thickest and the richest in iron, but the Pecten bed really forms 
part of it and was worked along with it. This cannot be done 
anywhere else in Cleveland. 
On the map is an irregular dine commencing at Eston 
(marked A), and ending at Hawsker (H). Between these 
two points all the sections on the first portion of the diagram 
were taken, and the positions of the several sections are in- 
dicated by letters corresponding with those heading the 
columns on the diagram. 
On the map is also shown a line beginning at the same 
point (A), and proceeding in a southerly direction to Ingleby 
(J), and thence in a direction west-south-west to Swainby. 
Intersecting the southern line at Roseberry (J), is another 
line more or less easterly to L2 and thence north-easterly 
until it cuts the line from Eston at Staithes (F) thus forming 
an irregular triangle. The position on the map of the different 
sections shown on all the diagrams is indicated by correspond- 
ing letters. 
It has been shown that the ironstone thins out and becomes 
split up along the most northern line. Taking the base of 
the triangle, starting at Eston (A), Roseberry Topping is 
ig13 May 1, 
