126 The America a Geologist. i-ciinmry, 1893 
ence of glacial man in America. The existence of glacial man in 
America would seem, therefore, to be proved beyond "' reasonable 
doubt." Those who are exj)ressing doubts are speaking, for the most 
part, in ignorance of evidence which has long been before the public. 
Probably, in my book, I should have had this class of doubters more 
in mind and have stated the evidence more fully. But there is a 
limit to what can be put into one small volume. 
Jiiiiiiiirii Ufh. IS'.i.l. G. Fi;ki)i;i:i( K Wjii(;nr. 
A Xkw Locality for Mu-lkkitk. Fur a number of jears there have 
been noted occasionally in "geode collections" examined from different 
parts of Lee county in southeastern Iowa certain specimens contain- 
ing clear calcite crystals, traversed in different directions by minute, 
j-ellowish filaments, after the manner of the familiar ttrclifK iVainour — 
the rntile needles in ((uartz. The "geodes" of the region are from the 
Keokuk limestone of the lower Carbonifei'ous. or ^Nlississippian, series. 
As is well known thej' are spherical concretions of silicious matter, 
sometimes solid, often hollow and lined with crystals of quartz or cal- 
cite — veritable crystal grottoes in miniature. In size they vary from 
half an inch to two feet in diameter. Not unfrecjuently various 
metallic minerals in more or less well bounded crystallographic forms 
stud the outer surface of the calcites and quartzes. Among these 
may be mentioned sphalerite, chalcopyrite and iron pyrites. 
Recently in opening a large quarry in the vicinity of Keokuk in the 
compact Keokuk limestone some feet below the regular "'geode bed." 
numerous cavities were encountered varying from several inches up 
to perhaps twenty inches. These hollows have large thickly set rhom- 
bohedrons of calcite jutting out towards the center. The faces are 
brightly polished and the edges are sharply cut. In some of the cal- 
cites have been found most beautiful tufts of closely arranged brass- 
yellow needles of millerite pointing from the center of attachment in 
all directions to a distance of one-half to two and one-half inches. In 
some of the examples the tufts are made up of hundreds of filaments, 
often so close together that the needles of different bunches are in- 
terwoven closely, forming a dense, matted mass. Often a large, per- 
fectly transparent calcite has a tuft of long millerites completely in- 
closed in it ; or part of the tuft may Ite imbedded in the lime crystal, 
the extremities of the needles left projecting outside. 
This is the first time that any of the nickel-bearing minerals have 
been reported from Iowa ; and the noting of the sulphide of the metal 
is therefore of considerable interest. The Keokuk occurrences are 
believed to be the most beautiful ever found in this country, if not in 
the world. 
Mr. C. A. Flannery of Keokuk has very lately come across another 
"pocket" of similar geodes containing millerite. One specimen of 
calcite covered thickly with needles of the nickel sulphide weighed 
over fifty pounds. Cu.mji.ks U. Kkvks. 
/>r.t .}fi,liics, h)ii((, Dec. iJ. ISU..'. 
