368 General Strata. 



it must have been deposited from water, in a state of forcible 

 and violent action. To make its character perfectly evident, 

 it must be so situated, that the elevation of the water, suffi- 

 cient for making the deposit, could not have been effected 

 by any existing cause. 



23. Ultimate Diluvion, a thin deposit of yellowish-grey 

 loam, reposing on crag or some other substance in ancient 

 uncultivated forest grounds. It is so situated, that it could 

 not have been produced by the disintegration of any stratum 

 in the vicinity, nor by water when running with much veloci- 

 ty. It appears to have been deposited from waters greatly 

 elevated,, and which had been rendered turbid by violent ac- 

 tion, but had become almost quiescent. It may be consider- 

 ed as the last settlings of a deluge. 



24. Post-diluvion, when the detritus is so arranged that 

 coarse pebbles appear towards the source of the waters 

 which deposited them, and fine sediment more remote. 



Names under the Analluvial Class. 



25. Stratified Analluvion, is the detritus, formed by 

 the disintegration of rock strata, which remains in the situa- 

 tion formerly occupied by the rocks, retaining the same or- 

 der of superposition. Subdivisions. — These take the names, 

 and retain the essential characters, of the original rocks ; as, 

 saliferous, ferriferous, lias, fyc. 



26. Superficial Analluvion, is the detritus formed by 

 the disintegration of the exposed surfaces of all rocks, and 

 remains on or near the place of disintegration. Subdivisions. 

 — Clay-loam, when the detritus is fine and adhesive. Gran- 

 ulated, when in coarse grains, or friable. The character of 

 the soil depends on the character of the rock disintegrated. 



Query — Could not the antediluvial detritus be divided into 

 primitive and secondary, as proposed by Mr. Schoolcraft 1 

 See Index to the Geology of the Northern States. If this is 

 practicable, it would carry us farther back into the history of 

 the antediluvial world. The primitive would probably be 

 found to contain either no organized remains, or those of ma- 

 rine origin only. The secondary alone Would contain the 

 antediluvial organic relics. 



