nigh siages of wa 
_ If we consider ol manner in which these rivér bottoms have — 
been formed, as it has been admirably illustrated by Prof. Swal- — 
low, (Rep. of Geol. Sur. Missouri, ) the layers of pe ace, mould 
appearing to have been formed at thé bottom of lakes, or in — 
swampy depressions, left filled with water on the retiring of the. 
greater overflows, or on a change of the bed of the river, at ¢ lise 
tant periods of time, and that, in these lakes aud depressions, @ 
' deposit, at first, of clayey sediment, and then, of decaying vege- — 
table matters, gradually accumulates to a aie depth, be- _ 
fore another overflow covers the whole, again, with a layer of 
‘sand and gravel, it would seem pucemenly to o be inferred, that 
_ this ch a lake, or swamp, an 
hi aesed. was slowly covered over 
in in course er te the gradnal formation of the rogernbig layer; @ 
another and older position to be re-deporited u 
— than ae in which the Masto 
Oe nS er ee glia ea 
eer er et 
on lived. 
¢ Your Bess ay the Ruins ge vi , 
} cue G. Sevrrarti. chee, IV.) 
Tit of f calling attention to a burnt brick 
h, me property ra a Soe of St. Louis, perhaps 
Ty cu r . 
