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| NATURE OF THE STRATA, AND GEOGRAPHICAL DISTRIBUTION 
| OF THE ORGANIC REMAINS IN aee FORMATIONS OF THE et. 
iue UNITED STATES. By James Harr. Read bi Aie Association of Ameri- E. 
1 can ieee and Bperelists, at their Fourth anual Meeting, held int A 
| bany, Ani , 1843. ho S * : 
Tür. investigati on ks ofa sedimentary dep reveals to us 
t ni conditions the bed of the formerly existing. , and 
is ata 
nts, rhage history an Fite ate. (oe 
eae ich Ee. the — 
thickness of strata in one dit 
? ^ do others more Or less distant. "Tie d irs, per- * pt 
river, As this means. spread widely oer 
ibited by myriads of living 
