II4 FIELD CoLUMBIAN Museum — GEo_LoeGy, Vou. III. 
scriptions of this meteorite* it has merely been stated that the mass 
was ‘irregularly triangular and much broader than thick’’—and no 
dimensions have been given. 
The form of the Iron Creek meteorite, as seen from its cast, is that 
of a low cone, 8% inches (22 cm.) high and 22 inches (56 cm.) in diam- 
eter. The outline of the base of the cone is an incomplete circle, an 
approximately straight contour cutting off one side so that only about 
three-fourths of the circle is present. The width of the mass in this 
direction is 17 inches (43 cm.) Were the circle complete the apex of 
the cone would occupy a position near its center, but with the mass 
shaped as it is the apex is situated close to the straight side. At one 
point where the straight side joins the circular outline there was evi- 
dently, in the original mass, a prolongation perhaps a few inches in 
length, which having formed the most convenient part of the meteor- 
ite for removal has been sawed off for purposes, doubtless, of analysis 
and distribution. - While the form of the meteorite as a whole is coni- 
cal, it is also arched, the base being concave and the sides convex. 
The greatest depth of the concavity of the base is about one and a half 
inches and occurs opposite the apex. This general concavity is 
also subdivided by two secondary concave areas, one about seven 
inches (18 cm.), the other about ten inches (25 cm.) in diameter. 
These are again subdivided by broad, shallow pits from two to four 
inches in diameter. The perimetral edge formed by the meeting of 
the sides and base is irregular in contour and from one to two inches 
in thickness. The broad, shallow pits of the base, which by their 
form characterize this as the rear side of the meteorite are, as has 
been stated, from two to four inches (5-10 cm.) in diameter. Their 
form is approximately circular although they at times tend to be oval 
or polygonal. The ridges between the pits are low, rounded and 
merge into the pits. The pits of the convex surface of the meteorite 
present considerable contrast to these. They are smaller, rarely ex- 
ceeding two inches (5 cm.) in diameter, are deeper in proportion to 
their diameters, more irregular in shape and the ridges between them 
are higher. They lack uniformity of shape or arrangement. Someare 
long and narrow, others three-sided, others again more nearly circular. 
The apex of the cone appears to have been less oxidized than the rest of 
the mass, indicating that the crust had sprayed off at this point. 
It presents a smooth surface about two inches (5 cm.) in diameter, 
convex except for a small, saucer-like depression about 4% inch (1 cm.) 
in diameter inits center. The base and the sides of the cone meet ina 
sloping edge except on the side already described as approximately 
*1887 Proc. Trans. Roy. Soc. Canada, Vol. IV. p. 97. 
