BONNEVILLE FAULTING 
143 
these very fossils that Ulrich verified identifications made by 
Bagg. 
From the character of the organic remains the presence of 
rocks of Devonic age was early recorded. Both James Hall and 
Thomas Antisell, in 1856, called attention to the characteristic 
fossils. There were numerous later references previous to 1906. 
In 1905, under the title of Morenci Formation the black shale of 
southwestern New Mexico and eastern Arizona was referred to 
the Devonic age. 
Mississippian fossils were identified from the limestones of 
Lake Valley as early as 1881, by White and by Miller; by Endlich 
in 1883, by Springer in 1884, and from as far north as the 
Magdalena Mountains in 1905. 
Thus the government claimants for priority are woefully be¬ 
hind in their discoveries; 32 years behind in the case of the Cam¬ 
bric rocks; 58 years behind for the Ordovicic strata; 3 years behind 
for the Siluric formations; 50 years behind for the Devonic rocks; 
and 25 years behind for the Mississippian limestones. More than 
a score and a half of good, distinguished, and conscientious geolo¬ 
gists visited New Mexico before them. 
So it appears that the older Paleozoic rocks of New Mexico 
were announced to the world long before the recent ‘‘discoverers’’ 
were born. But under the notarial seal of the Government and 
by special “permission of the director of the United States 
Geological Survey,” the later pronouncement alone is to have his¬ 
toric authentication. In a petty effort to forestall publication of a 
simple section the Government failed by half a century to secure 
priority. 
Faulting of Bonnkvillf Lakf Deltas 
In that masterly diastrophic chapter of his monograph on the 
“Quaternary History of Lake Bonneville” Gilbert lays particular 
stress on the orogenic significance of the numerous minor faults 
which traverse the old lake deltas parallel to the Wasatch axis. 
He argues strongly for these faults being secondary expressions 
of a premised master-fault which he claimed gave rise to the 
Wasatch Range in very late geological times. Manifestly this 
entire chapter is a digression in support of his other cherished 
