C. A. White—Molluscan Fauna of the Laramie Group. 207 
Art. XXIII.—Late Observations concerning the Molluscan Fauna, 
and the Geographical extent of the Laramie Group; by C. A. 
HITE. 
THE observations that have been made concerning the faunal 
characteristics and geographical extent of the Laramie Group 
during the past year are of considerable importance. e now 
now the strata of that group to exist at numerous and exten- 
sive localities through more than twenty-four degrees of lati- 
tude; that is, from the State of Nuevo Leon in Mexico to the 
Valley of the Saskatchawan in British America. 
many fresh-water and land mollusks. This fauna characterizes 
a great wide-spread geological group of strata in the most dis- 
tinct and unequivocal manner, several of its molluscan species 
now being known to occur at localities more than a thousand 
miles apart. 
It is cause for great regret that the admirable Text-book of 
Geology lately published by Professor Archibald Geikie should 
contain so erroneous a statement as it does of the molluscan 
fauna of the Laramie Group. I do not hesitate to assert that 
numerous species which do characterize that group are any- 
where mentioned in the book. With due recognition also of 
the value of the geological labors of Professor J. J. Stevenson, 
who bas published several articles in this Journal, and in the 
Wheeler Reports, upon the Laramie Group, I am quite unable 
to reconcile his statements with my own extensive observations 
of that group and the study of its fossils. That any trae Lara- 
mie strata ever alternate with those of the Fox Hills Group, or 
any other marine Cretaceous group; or that any true marine 
