32 Rev. P. B. Brodie on the Correlation of the Lower 7Jas 



him, taken from an upper quarry of Mr.Lee^s, in order to identify 

 the beds, where we have, in descending order, 



ft. in. 



1 . Drift- sand and red clay, with rolled boulders of Lias . 8 



2. Blue shale 3 



.§ (3. Hard blue limestone (rummels), with young Lima 



^ J gigantea, L. duplicata, and numerous characteristic 

 1 1 Ammonites of the Lima series, which is here much 

 H I reduced in bulk 9 



4. Thick blue shale 4 



5. Blue limestone 6 



6. Black shale 1 2 



7. Limestone 6 



8. Black shale 1 



9. Blue, nodular, and crystalline limestone (top hurls) — 

 a very peculiar band, resembling a stratum adjacent 

 to the *'firestone" of Warwickshire, as at Wilmcote 

 and Grafton in that county . . 6 



10. Shale. 



Bottom of quarry. 



Total 19 5 



As Mr. Jukes correctly observes, the strata vary considerably, 

 even in adjacent quarries; certain beds thin out, and others 

 come in : thus, in Mr. Ellis's large pit on the other side of 

 Barrow, there are at least 30 feet of shale above the " rummels '^ 

 (No. 3 in the section), and there are more courses of limestone, 

 especially those which appear to represent the "Insect-lime- 

 stones." The " rummels " (No. 3) is evidently the equivalent of 

 the " Xzma-beds " elsewhere, though only 9 inches thick; and 

 these are immediately succeeded by the "Insect-limestones" 

 and included shales, which are not generally so largely developed 

 here as they are in Warwickshire and Worcestershire as to 

 number and thickness, although on the whole the series which 

 may be considered to belong to this zone is quite as thick as it 

 is in Warwickshire. Deducting 8 feet for the superincumbent 

 drift, the total thickness of the Lias exposed in the above section 

 is only 11 feet 5 inches. In another of Mr. Lee's quarries a 

 section given by Mr. Jukes makes the Lias 28 feet 6 inches, 

 and one at Horton 20 feet, the Xzma-beds being 6 feet at the 

 former. It is impossible to say to what extent the Ostrea- and 

 other beds prevail here, or whether the Rhsetic series is present 

 beneath, as indicated by a boring below the "firestones" at Wilm- 

 cote in Warwickshire. But possibly there may be a considerable 

 thinning-out of this lower portion of the Lias and the under- 

 lying Rhsetics in this direction, although they have been lately 

 detected by Mr. Burton near Gainsborough, in Lincolnshire, 

 and described by him in a paper read at the late meeting of the 



