F. V. Hayden on the Geology of Kansas. 33 
upon the Fusulina shales.” Now the facts here mentioned, even 
if we admit that the very same beds have not been mistaken for 
others, or the contrary, from a change in their lithological char- 
acters at different localities, do not establish non-conformability 
as that term is used by geologists. As properly used in geology, 
the word unconformable is applied to two or more beds or sets 
of strata, resting one upon another, and dipping at different 
angles or in different directions in consequence of the older 
being tilted from their horizontal condition previously 
to the deposition of the later ones. Such disturbances or want 
of conformity in the planes of strata, are usually accompanied 
by differences in the groups of fossils above and below the line 
of non-conformity, and thus indicate a considerable change of 
See conditions, as well as the lapses of long periods of time, 
ditions between the deposition of the above and below 
horizon of the locally absent strata. Every one who has studied 
our western -measures attentively, must be aware that noth- 
m 
sometimes come.in contact, forming a single bank.” Again,on | 
218 of the same report in speaking of the divisions of bed 
dis y ai 
(ib., p. 228), in speaking of the Colchester bed (Coal No. 3) sae 
ly se} from the conglomerate, or mill-stone grit, by 
to be wanting here. ie. 
In the same Report, he has shown, that in tracing the Coal- 
measures a little west of north from southeastern Illinois where 
Am. Jour. Sct.—SEcoND SERIES, Vou. XLIV, No. 130.—Juxy, 1867. 
5 
