228 MR. H. H. AENOLD-BEMEOSE ON THE GEOLOGY OP [May 1859, 



The distance of A above the ash was 22^ feet at the southern end. 

 The bed A was easily traced through this part of the cutting, and at 

 its last appearance was found to be 28| feet above the second 

 exposure of ash. It varies in thickness, thinning out from 3^ feet 

 at the southern end to 1 foot at the northern. It contains chert, 

 and in many places volcanic lapilli occur disseminated in it. 



The upper bods, marked B, are easily distinguished by the fact 

 that they are thicker than the other limestones in the series. They 

 are first found near the southern end, at a height of 59| feet above 

 the ash. They are seen again in the middle limb of the first fold, 

 and then at the top of the cutting immediately beyond the tem- 

 porary bridge over which the road to Matlock passes. They 

 contain encrinite-stems, Productus, and sometimes lapilli. Like 

 the bed A, they vary in thickness : in a distance of about 43 yards, 

 measured parallel to the original bedding-plane, they thin out 

 from 9| to 6 feet, and when seen for the third time are 7^ feet 

 thick. 



There is, therefore, no doubt that the first and second exposures 

 of ash in this cutting are of one and the same bed, the shales and 

 thin limestones above it having been bent into a number of small 

 folds which amount in effect to a syncline. 



The total thickness of these beds above the ash in the first part of 

 the cutting amounts to 94 feet; and the intermittent showers of 

 lapilli were continued, until beds at least 66 feet above the main 

 body of ash had been deposited. It will be noticed from vertical 

 section No. 1 (PI. XVIII) that the limestone becomes thicker and 

 the shales decrease in quantity towards the top of the series. Chert 

 is found in len tides and in bands in many of the limestones, some 

 of which are dolomitized, and others of which are dark and fine- 

 grained. Dr. Wheelton Hind found fish-teeth in the thicker beds 

 of limestone.^ 



The beds in the northern part of the cutting above the second 

 exposure of ash consist of shales and thin limestones, often ashy, 

 folded into two troughs and crests. A thickness of 97 feet of strata 

 is seen above the thick ash-bed, and the intercalated tuffs were found 

 up to a height of 61 feet in the series. 



It is impossible to correlate the thin limestones in the northern 

 and southern portions of the cutting. They vary in thickness, and 

 are probably not persistent for so great a distance, wherefore some 

 of them thin out and disappear while fresh limestones make their 

 appearance. There is, however, one band of limestone in the northern 

 part, which may be the same as that seen six times in the southern 

 part. It is 1| feet higher in the series, namely, 30 feet above the 

 ash-bed, and is marked C in PI. XVII, fig. 1, and in PI. XVIII, fig. 3 ; 

 it is seen twice in this part of the cutting. 



An ashy limestone, marked D in the above-mentioned sections, 54 

 feet above the ash, is seen three times, and a well-marked group of 

 cherty limestones (in which galena was found) near the top of the series 



^ ' Descr. of Section in Carb. Limest. Shales at Tissington,' N. Staffs Field- 

 Olub, Nov. 17th, 1897, 3 pp. 



