186 Geological Remarks ow the 



from SE. to N\V., since or at the time, that the deposition 

 of regular strata ceased, as observed p. 37. 



It struck me, as among the curious circumstances of the 

 basin of Paris, that the strata throughout it are horizontal, 

 at least only one itistance to the contrary is mentioned 

 (p. 43), and that faults or such like derangements of the 

 strata are nowhere mentioned. 



All ihe southern parts of Derbyshire and part of Lei- 

 cestershire adjoining, abound with red carih or gypsous 

 marie (entirely without fossils I believe) that is 7n like 

 manner horizontal throughout, with three exceptions only, 

 that I could discern : viz. at the S. of Burton Trent bridge 

 on the E. side of Catton in Croxall, and MW. of Stretton- 

 le-ficlds 5 the second of these only has any considerable 

 inclination : although tilts of the strata are so rare in our 

 gypsous strata, yet itiany faults seem to occur in them : a 

 most tremendous one fcrms the northern limits of the i^^vp- 

 sous miarle for 40 or 50 miles, and four or five isolated Time 

 and coal districts witliin it, seem surrounded by great faults 

 and to be intersected by numerous others, occasioning as 

 inclining and dislocated strata at Breedon, Cloud's hill, 

 Measham, Sec. as can almost any where be found. 



It is stated by our authors (p. 54 and 5 't), that their 

 Vlh and Vlth soils are placed side by side of each other : 

 if these be really different soils, and not the same somewhat 

 naodilied in their substances, the fossils in one of them 

 also not being preserved, (of which I entertain some sus- 

 picion) a fanlt must, in all probability, ranse between the 

 two places where these soils have been noted, which ele- 

 vates one of ihe soiis or depresses the other. 1 would also 

 here suggest as a query, whether their Vlllth soil be 

 not a similar repetition of pan of these same soils? Its 

 fresh-water shells are not sufficient^ I think, to prove it an 

 upper soil ; and in the latter p?irt cyf the Memoir we are not 

 presented with the same evidence pf the superpc^sition of 

 the different soils as we are with respect to the first In'c, 

 which may hov/ever have arisen from the haste in which 

 the Memoir seems to have been pre]-)ared. 



I do not rc*member to have seen any where, the appear- 

 ance of limestone strata Upon the chalk in England, or to 

 have heard of any such from Mr. Smith, or otherwise : of 

 gypsum T think we may safely say that there are no strata: 

 but crystals of selenite abound in the London clay, and 

 there are numeious patches of plastic clav, used in some 

 places on our ciialk hil'^ for potttry and brick-making, 

 which geem to answer pretty well to the description of 



some 



