136 NEW YORK STATE MUSEUM 
only does the overlying strata of liméstone contain numerous included 
flint nodules, but the limestone in immediate association with the calcite 
crystals gives on solution a residue of minute quartz crystals similar to the 
residue from the Union Springs limestone. The presence of crystallized 
quartz in connection with the occurrence gives additional cvidence of a 
crystallizing solution highly charged with silica. 
Zone [4041.1120]. Forms in this zone although to an extent distributed 
throughout the 20 localities discussed appear to be quite consistently 
present on the crystals from the localities of group V, the only notable 
exception being that of Rondout. With respect to this latter occur- 
rence, it is interesting to note in this connection that the scalenohedron 
® (15.4.19.3), particularly characteristic of the Rondout calcite, lies close to 
the zone under consideration, and that its presence might well be due to 
some local influence operating to disturb the equilibrium of the crystallizing 
forces. The fact that the occurrences of group V, so closely related with 
respect to geologic conditions, are characterized by a series of scalenohe- 
drons closely related crystallographically is at least suggestive. 
Zone [o112.1120]. The negative scalenohedrons of this zone occur on 
calcite crystals from four localities, viz: Antwerp, Somerville, Lyon Moun- 
tain and Arnold Hill. With the single exception of Mineville, where the 
type studied was obviously representative of an early generation of calcite 
. formation, these four localities represent all the occurrences of calcite asso- 
ciated with iron ore included in this work. The coincidence of this set of 
conditions with the production of crystal forms closely related in zone is 
again suggestive. 
