104 DOMAIN IX. ANOMALOUS. 



about 20 miles E. and W. and about 10 N. and 

 S. which may be indicated as the peculiar dis- 

 trict of the Kollanite, or precious pudding- 

 stone. 



Shells, or strong and marked impressions, have 

 been found in the very centre of masses of Kol- 

 lanite, which with its superincumbence on 

 chalk (where however it only forms detached 

 masses, like those of siliceous sand- stone, or gra- 

 nular quartz), have been regarded as proofs of 

 its recent formation. 



On Barnard Heath, near St. Albans, along 

 with the masses of pudding-stone, which them- 

 selves always appear to have been rolled, may 

 also be found bowlders of black jasper veined 

 with white quartz, the siliceous schistus of Wer- 

 ner, with others of red jasper, of granular quartz, 

 and even of rock crystal ; so that the position 

 would argue little, while the shells alone would 

 evince it a secondary substance. They are 

 commonly small chamites; and, it is believed, 

 have never been discovered in the finest kinds. 

 Mr. Parkinson* has observed, that the numerous 

 pebbles found in gravel-pits, &c. have seldom 

 been rolled j but, on the contrary, their present 

 forms are precisely those which they at first de- 



* Organic Remains, i. 283, 



