Geology of England and Wales, &c.” PS 
A fuller and very satisfactory account of the diluvial 
formation is given in the Introduction : (p. 28 et Seq.) 
And although it occurs in every part of the globe, covering _ 
probably more surface than any other ; yet has it hitherto * 
been passed, by geologists, in silence ; or scarcely noticed; 
or blended with alluvium. It is the geest of Kirwan ant 
Jameson, und the diluvian detritus of Buckland ; (Rees’ 
Cyc Add. Art. Geology) which, however, he has put down 
under the general name of alluvium. It must not be sup- 
posed, however, that all beds of loose sand and gravel are 
he Such beds often occur interstratified with regu- 
Jar strata of clay, and even consolidated rocks ; as will be 
seen in the sequel. Deposites of sand, gravel and bowlder 
stones are not dilnvial, unless they occur above all regular- 
ly stratified beds, and the ingredients are confusedly mingled 
together. This formation exists abundantly, in the United 
States. In-what places it is found sufficiently thick to re- 
quire a place ona geological map, may a question of 
some diffculty. Martha’s Vineyard, Elizabeth Islands and 
ng Island. with perhaps some spots along the southeas- 
tern coast of Massachusetts, and the region a few miles 
west of New-Haven, are the only instances of this kind, 
which we, at this moment, mention with confidence. _ 
We are pleased to find the diluvial formation so definite- 
ly described and limited in the work before us: and 
cannot but earnestly recommend to American geologists to 
make that work, in this particular the standard of their de- 
scriptions. a 
Strata above the chalk. “ These consist of various beds 
of sand, clay, marle, and imperfectly consolidated lime- 
( ) No superior or more recent regular for- 
i f the earth yet ex- 
amined, with the exception of some trap rocks probably of 
volcanic origin.” (Note.) These strata are subdivided as 
