J. D. Dana— Hudson River Age of the Taconie Schists. 888 
Eastern Washington. It stops in the latter town just east of 
Mabbitsville. But six miles south, in the next town, Unionvale, 
it appears again in the valley of the Clove, and follows Fishkill 
Creek to its junction with the Hudson. At Poughquag, it has 
the extraordinary breadth of three miles, and it continues to 
have great width past the village of Old Fishkill; but it then 
narrows, becomes confined to “the south side of the Fishkill 
of she borders of the oe: River region and the schists of 
the Taconic Mountain 
e limestone is chroughiad as decidedly crystalline as in the 
northern half of the . ae belt (though never 
coarsely so); and hence fossils e uncommon if occ 
ring in it at all. In many slaske. pees suggesting a fousil 
origin are to be met with. 
Wherever the limestone contains seams of quartz such indi- 
cations rarely occur, the most suggestive appearances being 
small and thin isolated oe of quartz, arcuate in section. Since 
carried forward by hot siliceous waters (not cold, as in the case 
of silicified shells in an unaltered limestone) during a time of 
m 
where the limestone is without quartz, and the seams and spots 
it contains are of white calcite. One of this kind, which I 
the base of the Taconic Mountains, seemed to be part of a 
valve of a ribbed Brachiopod, and others of like cage ahh 
ness were met with in some of the limestone cuts betw 
Hopewell and Fishkill. Such appearances favor the ex 
tion that digfingt fossils sie ee * ioe in am belt. tia 
ri i small in 
the limestone evidently concealed beneath. The limestone reappears where ag 
valley opens again, along Clove Brook, and is thence continuous to the Hu 
