CHELLASTOX GYPSUM UHECCIA. 



181 



part 3] 



pale-green calcareous (or possibly dolomitic) mud was attached to 

 each fragment of white gypsum, and it was obvious that in nearly 

 every case it had endeavoured to find its way by gravitation to 

 the bottom of the ' pot,' and in so doing had caused the white 

 fragments to revolve to such an extent that their original upper 

 surfaces are now underneath (fig. 4). The green marly slime appears 

 to have crept downwards along the curved walls of the pots also. 



In the red gypsum, again, as above stated, there is sometimes 

 more than a suggestion of bedding, especially if a little marl is 

 present. At one point there was a series of small folds and faults, 

 apparently caused by descent of the white lumps and the upthrust 

 of red gypsum to take their place. 



Fig. 4. — Masses of white alabaster with adherent green ' cap ' 

 (black) in red alabaster, Chellaston. 



V 3 feet. 



In the lower layers of coarsestone the rounded lumps of white 

 gypsum are probably original secretions, similar to the rounded 

 lumps found in all gypsiferous beds (see below) ; a few of them, 

 however, may be the ultimate result of the revolution of broken 

 fragments. Similar little segregations occur in parts of the green 

 and grey marly ' cap' that have slid down into the red gypsum. 



Location of the Breccia. 



The brecciation is peculiar, local in occurrence, and seems to be 

 entirely due to the formation of the gypsum in more or less isolated 

 spots. The green-stained alabaster is an unusual type, rarely found 

 in other mines or quarries. A little occurs at Woodlands, and 

 there is said to be some in the Duddle workings of the Aston- 

 (xlebe Mine, about half a mile away. It has also been recorded 

 from Kingston-on-Soar and Castle Haves, between Tutburv and 

 Fauld (see p. 183). 



