1884.] Vestiges of Glacial Man in Minnesota. 703 
opaqueness, color, hardness, cleavage and admixture of foreign 
matter. The mode of occurrence of the more erratic specimens 
is noteworthy, and leads to the inference that they may have 
been fashioned from drift boulders, numbers of them, indeed, 
having béen evidently formed of waterworn pebbles. Objects 
shaped from some special variety of quartz not unfrequently pre- 
sent themselves in loose clusters, varying in number from two or 
three to a dozen or so pieces. Thus a single specimen of a 
tinted, mottled or otherwise distinguishable quality, has quite 
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commonly been found associated with others of the same species 
of mineral. When one of these is of comparatively large size, 
the remaining objects are in many cases proportionally small, as 
if they had been shaped from fragments of the largest. In one 
= Partof the stratum I chanced upon several small quartzes which 
i were, for the most part, longish splinters, and which had a pecu- 
liar sort of odlitic fracture closely resembling the grain of curly 
maple. I have never happened to find this sort of fracture in 
quartz from the Little Falls slates, though such may perhaps 
*xist; but in studying a few boulders from the till, artificially 
3 up, I discovered a single waterworn mass, ten to twelve 
inches in diameter, having the same fracture. I afterward, at 
various times, encountered pieces of similar character at the 
Stratum, three or four perhaps in a spot. These fragments have 
l believe, been inconsiderable in size. Now had even a small 
3 lump of this Special sort of mineral been either disintegrated, or 
; broken up upon the ground by human agency, a confused mass 
-of bits of different sizes must naturally have resulted—which is 
E oet It is therefore not unlikely that the peculiarity of 
cleavage unfitted this quality of quartz for being worked into 
ri implements, but that in accidentally reducing small boulders — 
"E the quartz-workers selected from the splinters such bits as 
: “uld in some way be turned to profit. 
LOM ey ne ee ee a ee ee ee eee! he Nt eo 
a Winchell says of terrace surfaces adjacent to the 
7 Te stratum: “There is no point throughout the whole region 
: oye where the slate conveying these quartz veins rises to 
: aa of the surface of this plain so as to.be within the range 
flo 8 k ing agències, whether of the water of the river or of 
Pines J e, ? 
q's statement concerning fragments diffused through the sur- 
* Soil is; of Course, not necessarily applicable to a plane a con- 
