TALCOSE SCHIST. 



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with clay slate, may be seen a few rods east of the State House in Montpelier, at a Catholic church. North 

 of the State House may be seen another very common variety. The ledge is compact, with few traces of 

 stratification, like ledges of serpentine, and the rock is very coarse grained: being apparently composed of 

 coarse unctuous crystals of the nacreous mineral constituting much of the rock. In other cases, like the 

 specimen analyzed from Roxbury, the feel is somewhat unctuous, and very fine crystals appear elongated 

 like delicate forms of hornblende. But of these unctuous varieties there is an endless variety. Most of 

 the specimens upon the sections of this formation might profitably be described thus minutely. 



Of the harsher variety there is a great amount. Every grade from soft nacreous schist to sandstone 

 may be found. Generally it differs from the other varieties only by its roughness, and there is a corres- 

 ponding variety in its texture. Certainly this is not talcose schist, because the essential characteristic of 

 that rock, the softness, is wanting. But we have proposed no new name for it, calling it gritty talcose schist, 

 talcose grit, or perhaps the term used for an analogous rock, talcose quartz rock. All these names are 

 erroneous : but in the present state of our knowledge an error will be conveyed by their provisional use. 



To show the nature of this formation we will present a list of the different varieties passed over between 

 the clay slate in Montpelier, and the gneiss in Duxbury, along Winooski River. This section crosses the 

 principal range, and was the most carefully measured of all the sections. Every ledge was examined along a 

 region where they were unusually numerous. Although there is no evidence of a fold in this section, we 

 suppose one to exist there, and hence the rocks are repeated. But we are unable to draw the exact line, and 

 therefore mention the character of the successive layers over the whole section, commencing at its eastern 

 boundary, following the clay slate. 



Talcose slate, cleavage like roofing slate. 



Common talcose schist, slightly unctuous. 



Very soft coarse grained talcose schist (north of State 



House.) 



Gritty talcose schist. 

 Compact bright green talcose schist. 

 Gritty talcose schist. 



Talcose conglomerate, with a few crystals of feldspar. 

 Soft unctuous talcose schist. 

 Talcose sandstone. 

 Stratum of quartz (six inches.) 

 Decomposing gritty talcose schist. 

 Compact talcose schist (altered sandstone.) 

 Gritty talcose schist. 



Ordinary talcose schist, slightly unctuous 

 Compact talcose sandstone. 

 Talcose schist, slightly unctuous. 

 Pea-green and easily decomposing talcose schist, 



abounding in veins of calcite and transparent 



fetid quartz. 

 Gritty ialcose schist, Middlesex east line. 



Talcose schist, slightly unctuous. 



Compact talcose schist, slighty unctuous. 



Soft argillo-talcose schist. 



Talcose schist, somewhat unctuous. 



Very gritty talcose schist. 



Light green talcose schist. 



Bright green talcose schist, rather soft. 



Novaculite schist. 



Gritty talcose schist. 



Very soft and unctuous talcose schist. 



Clay slate, or shales. 



Very soft and unctuous talcose schist. 



Plumbaginous shales. 



Beds of gritty talcose schist. 



Green novaculite schist (slaty.) 



Occasional strata of nearly pure brown quartz. 



Bright green talcose schist. 



Very soft novaculite schist. 



Novaculite schist.. 



Stratum of coarse talcose grit. 



Compact bright green novaculite schist . 



Soft and unctuous novaculite schist. 



Clay slate. 



Compact soft talcose schist. 



Talcose schist, soft and shining with veins of 



granular dolomite. 

 Talcose schist, weathering white. 

 Gneissoid talcose schist (feldspar probably, or 



Talcose schist (altered sandstone.) 



Talcose schist, intermixed with white granular 

 limestone. 



Serpentine soapstone, chlorite, massive horn- 

 blende, etc. associated together in Moretown. 



Talco-micaceous schist. 



Beds quartz rock mixed with coarse talcose sclu'st. 



Thick mass of white limestone. 



Talcose schist passing into gneiss. 



Gneiss in Duxbury and Waterbury. 



