Harris Invertebrate Fossils. — Sehnchcrt. 135 
Harper, George Oeh, C. L. Faber, Dr. D. T. D. Dyche (Leb- 
anon, Ohio), John Misner (Richmond, Ind.), R. S. Bassler, 
Dr. George M. Austin (Wilmington, Ohio), John Hammell 
(Madison, Ind.), A. Albers, George Asherman, George C. Hub- 
bard (Madison, Ind.). Truly, no other region has developed 
so many collectors, paleontologists, and stratigraphers ! 
A retrospect of the past twenty-five years, however, brings 
out another fact, namely, that the natural conditions alone 
will not produce a large crop of collectors. There nuist be 
also personal stimulus and example, and today the Cincin- 
nati hills, although as rich in fossils and far more accessible 
than in the days of horse cars, have no adecjuate band of 
Avorkers. It is true that here and there a new collector is 
attracting attention, but the teachers and exemplars of twenty 
years ago, as ]\Iiller, James, Wetherby, Hill, and Byrnes, are 
no longer present. The Cincinnati Society of Natural His- 
tory can again be this stimulus, as it was twenty years ago, 
and it is to be hoped that the present curator may receive the 
abundant support of the citizens of the Queen City of the 
West. 
U. S. National Miisetnii, January, 1903. 
BLOCK MOUNTAINS IN NEW MEXICO. 
By Douglas Wilson Johnson. 
PLATE XII. 
At the recent meeting of the Geological Society of Amer- 
ica in Washington, D. C, the papers of G. K. Gilbert, W. M. 
Davis, and M. R. Campbell on the basin-range structure of 
mountains led to a discussion of the detailed nature of block- 
faulting and some phenomena connected therewith. It was 
suggested by C. R. Van Hise that where such faults occur, 
the disparity in position of the strata on either side of the fault 
is brought about, not by a single great drop or upthrust, but 
by a more or less extensive series of parallel breaks. This 
Van Hise terms a "distributive fault," and he regarded such a 
fault as the usual if not necessary agent in the formation of 
mountains of the basin-range type. Davis was of the opinion 
that in the cases cited 1)\' him one gfreat fault along a single 
