210 Review of “ Outlines of the 
rine Zoophytes,”’ as well as volcanic products, are not 
reckoned as alluvial. In the work before us, particular 
descriptions of this, as well as the next formation, are re- 
served for the second part ; because a knowledge of the 
regular strata, from which they are derived, seemed previ- 
ously requisite. We perceive, however, that no place is 
given, on the map accompanying this work, to alluvial* ; we 
suppose because its extent, in great Britain, is so extremely 
limited. 
_ that the alluvial is one of the most extensive of our forma- 
tracts, marked as alluvial in this country, really belongs to 
that formation. It cannot be doubted however that along 
our rivers, especially ‘the larger ones, and at their mouths, 
examples of alluvium are not very unfrequent. The delta 
of the Mississippi furnishes a noble instance, i , 
Diluvial. Ymmediate!y below the alluvium “ we find a 
mantle as it were of sand and gravel indifferently covering 
all the solid strata, and evidently derived from some convul- 
sion which has lacerated and partially broken up those stra- 
ta, inasmuch as its materials are demonstrably fragments of 
the subjacent rocks, rounded by attrition.” “The frag- 
mented rocks constituting these gravel deposites are heap- 
fore, from the most probable views concerning the nature 
of this great catastrophe, been proposed to designate these 
ormations, which naturally constitute the second term of 
our geological series, Diluvig/,” 
i ee this is amistake. The Fens of Lincolnshire, and Ely, and 
parts ; eg Bears RL: ar o ch ri i d.—{ Ed.] 
