136 NEW YORK STATE MUSEUM 
and pegmatites are found the following minerals; anorthoclase, 
orthoclase, pyroxene (green), phlogopite, hornblende and titanite, 
while in the granitic syenites orthclase, quartz and hornblende are 
found. 
Generally in the Adirondack area the relationship of the syenite 
to the Grenville is an intrusive one, as C. H. Smyth (1)* and 
other Adirondack workers have so clearly shown. Though the 
contact between the syenite series and the Grenville marble is 
somewhat obscure, due to the occurrence of a bed of residual 
material or decomposed Grenville between the two, it is believed 
that this contact is intrusive because of the exomorphic effects 
observed in the marble, such as the occurrence of scapolite and 
the coarse crystallinity. 
The occurrence of the Grenville marble at this point is difficult 
to account for unless it is an inclusion incorporated by the intrud- 
ing syenite magmas. According to W. J. Miller (2); “It has 
already been stated that the syenite is intrusive into and younger 
than the Grenville and that the Grenville areas must be regarded 
as large inclusions. A study of the syenite-Grenville mixed 
eneisses furnishes convincing evidence of the same kind. Actual 
inclusions of undoubted Greenville may occasionally be seen in 
the vicinity of Lyons Falls; one-half of a mile north and 8 miles east 
of Port Leyden; one and one-half miles above the mouth of Fall 
brook, etc.” 
If this is true with respect to this occurrence, namely that it 
has been torn from some parent mass and later found lodgment 
in a magma which has long since been hardened and subjected to 
tremendous mountain-making disturbances, it would be reason- 
able to ascribe the fissuring of this rock to those movements. But 
such a fissuring would in all probability be filled with mineral 
matter more characteristic of the deeper seated rocks and min- 
erals such as is found in pegmatites of which we find no trace in 
this vein. Asa matter of fact the only direct evidence of any of 
the former constituents of this vein consists in the occurrence of 
some secondary minerals, as kaolin, vermiculite and calcite, the 
undoubted derivatives of the Grenville marble and its accessory 
minerals, such as are found in the hanging and footwall rocks. In 
these rocks we find very abundant phlogopite and some scapo- 
lite as well as their alteration products. Water-worn fragments 
of Grenville bear witness, in part, to the former composition of the 
* Note. Figures refer to notes in Bibliography at end of this paper. 
