84 Samuel Moore — An Unmapped Toadstone. 



IX. — Note on an Unmapped Toabstone Bed in the Derbyshire 

 Mountain Limestone.^ 



By Samuel Moore, Esq. 



IN the Summer of 1901 I found in a pasture, between Oxlow 

 Kake and Cop Eound (IX S.E.), some blocks of Toadstone in 

 a bed of clay that has all the characteristics of decomposed Toad- 

 stone. The clay was being dug for puddling a new mere, and the 

 deposit is well known to natives. I traced the outcrop south-west to 

 Starvehouse Mine, and my inference that the clay was decomposed 

 Toadstone was soon verified by the Toadstone itself coming to day- 

 light and replacing the clay. I did nothing more that year, but in 

 the Summer of last year I continued to follow the bed, and have 

 traced it as far as Bushy Heath House (XV N.E.), a distance of 

 about two miles from its starting-point. 



The outcrop starts as a clay bed, at the southern end of an 

 enclosure called Old Moor (IX S.E.), at a point about 50 yards 

 south-east of two old mine shafts, and where a spring issues from 

 under the limestone scarp, at a height of 1,400 feet above mean 

 sea-level (by aneroid). Thence it runs in a general south-west 

 direction for half a mile, along a line of five springs at the base 

 of the limestone escarpment, to the north wall of Starvehouse Mine 

 (IX S.E.), which it cuts at an altitude of 1,500 feet. 



There is no throw at the Starvehouse lode, and the bed contours 

 round the point of Cop Eound and crosses Dick Lane 30 yards 

 from the summit gate (1,510 feet) ; from there it runs south-east 

 with the dip of the limestone to Moss Eake (IX S.E.), the base 

 passing just above the letter n of Piece Barn on the map. It 

 reaches the lode at 1,350 feet. Here the bed is faulted and thrown 

 up to the north, and the top starts afresh about 180 yards up the 

 lode, at an altitude of 1,420 feet. 



The top then runs, along the base of a limestone scarp, to a point 

 beneath the Old Eoman Camp on Batham Gate (IX S.E.), ci'osses 

 the road at the gate to The Holmes (XV N.E.), and runs down, 

 through the farmyard, to the continuation of the Shuttle Eake lode, 

 below the old Calve Stones Mine plantation. 



There appears to be no fault at this lode, but the bottom of the 

 valley is flat and filled with superficial deposits which conceal the 

 outcrop. 



From The Holmes the bed is traceable still in a general south- 

 east direction, as far as an old quarry (XV N.E.) at an altitude of 

 1,300 feet, and 300 yards N.N.W. from Bushy Heath Farmhouse. 

 From there to Chap Maiden Mine (1,276/?) the traces are indistinct, 

 owing to flat ground. Beyond this point I have not at present 

 traced it, but next Summer I hope to do so. 



The bed of Toadstone hei-e described lies above the topmost bed 

 shown on the 1 inch map of the Geological Survey, and is separated 

 from it by nearly 150 feet of solid limestone. It varies in thickness : 



1 See Gaol. Surv. Map 81 N.E., original 1 inch scale ; Maps IX S.E. and 

 XV N.E., 6 inch Ordnance Survey. 



