610 MK. H. H. ARNOLD-BE3IROSE ON THE MICROSCOPICAL [JSTov. 1894, 



and Buxton. There may be three beds or even four. It will be 

 seen from the Table that the microscopic structure of the rock does 

 not settle the question. The only way of ascertaining the real 

 number will be by careful mapping over the whole district, and 

 working out the fossils in the different horizons of the limestone. 



I have been unable to find the following outcrops which are 

 mapped by the Geological Survey : nos. 11, 32, 35, 51, 55, and 61. 

 In every case except one, before giving up the attempt, I have 

 mapped the toadstone-outcrops from the 1-inch to the 6-inch map 

 and walked carefully over the ground. 



Kemp's Hill, Outcrop 11, is mapped as forming a closed curve or 

 ring round the hill which lies between Peak Forest and the station of 

 that name. I have found no traces of toadstone either in the walls 

 or in the soil. On the contrary, I found that several new quarries 

 have been opened in the limestone where toadstone is mapped. 

 The subsoil is of a reddish-brown colour similar to that covering the 

 limestone in the Small Dale quarries near by, and is not a decomposed 

 toadstone. There are a number of swallow-like holes in the lime- 

 stone just outside the ring of supposed toadstone which are similar 

 to those found in the toadstone between Dove Holes and Peak 

 Forest Station. I can hardly think that the former can have mis- 

 led the Geological Survey officers. All the evidence that I can find 

 is against there being a bed of toadstone on Kemp's Hill. 



Dove Holes, Outcrop 12. — This I have found, but there are doubts 

 as to whether it is an igneous rock. See under Tuffs. 



Taddinyton Field, Outcrop 32. — I have only paid one visit to 

 this place since mapping the rock, and have been unable to find the 

 outcrop where marked. In the Geological Survey memoir it is said 

 that the outcrop is difficult to find. 



Ditch Cliff, near BaJcewell, Outcrop 35. — In a field to the E. 

 of the road are some large blocks of dolomitized limestone which 

 might be taken for toadstone, before they are broken into. Lime- 

 stone is seen in several places on the hill, and in the soil by the 

 roadside. There are two or three blocks of toadstone in a wall 

 near, and one in the road-embankment amongst pieces of limestone 

 and chert. These blocks may have been brought from the Lathkill 

 Dale upper bed no. 36, a few fields away, or they may be from the 

 drift which covers the surface in the neighbourhood of Bakewell, 

 especially at the cemetery. I found a granite-boulder less than 

 2 mile from this supposed outcrop. I question whether there was 

 ever any outcrop of toadstone here. 



Minninglow, Outcrop 51. — Where the outcrop is mapped, the 

 fields are ploughed or covered with grass. A few blocks of toadstone 

 are found in the walls, but stronger evidence than this is necessary 

 to prove the existence of a bed. 



Tissington, near Ashbourne, Outcrop 55. — I have not visited this 

 particular locality since I obtained the 6-inch maps. On two visits 

 I have failed to find it. The ground is much covered with drift, and 

 some pieces of toadstone in it might have been taken for indications 

 of a bed. 



