Cretaceous in Northern Minnesota. — Winckell. 221 
collection:— Ostrea, Inoceramus, Modiola, Pinna, Yoldia f, Trigon- 
arca, Actxon ?, Trochus ? and Fasciolaria. A part of the species rep- 
resented by the specimens constituting this collection are evidently 
new. Some described species are thus represented, and others are prob- 
ably referable to described species, but they are too imperfect to admit 
of satisfactory determination. 
The Yoldia f referred to is much like the Y. microdonata of Meek 
and Hayden, reported to have come from the Dakota group of Kansas. 
The Inoceramus cannot be distinguished from the I. fragilis of Hall 
and Meek. This is a characteristic species of the Colorado formation. 
For this reason, and because that formation is known to be represented 
at other localities in Minnesota, I think there is little, if any, reason to 
doubt that the deposit from which you obtained these fossils represents 
a portion of the Colorado formation as it is developed in the great inte- 
rior part of the continent. 
This discovery of a Cretaceous deposit at a point so far to the north- 
east in Minnesota, is a matter of much geological interest, and, together 
with other similar discoveries in that state, leaves no room for doubt 
that the Cretaceous sea covered a large part, if not all, of its present area. 
Very truly yours, 
C. A. White. 
Notes on the collection of Mr. H. V. Winchell from northern Minne- 
sota. Received May 8th, 1893. 
In addition to the Inoceramus, Modiola, and one or two others that 
were sent in the first lot from the same locality, there are several other 
forms each represented by a single specimen, as follows: 
1. Placenticeras (Sphenodiscus) sp. undet. 
(Collected by Samuel Sanford.) 
Part of the inner whorls of a form related to P. (Sphenodiscus) len- 
ticulare Owen, from which it differs in having a broader umbilicus 
and more simple septa. 
2. Pholadomya 
Resembles P. subventricosa M. anrl H., though neither the type 
nor Mr. Winchell's specimen is well enough preserved to make the 
comparison satisfactory. 
3. Barbatia An imperfect cast. 
4. A Reptilian tooth. 
C. A. White. 
The discovery and determination of these fossils verify the 
observations made in 1887, and further determine that the 
strata belong in the Colorado group of the Upper Cretaceous. 
The fossils occur in greenish-blue shale lying beneath the gla- 
cial till. The shale is conglomeratic with fragments of tin- 
underlying taconyte which contains the ore deposits of the 
Mesabi. Some strata are hard and sandy, instead of conglom- 
eratic. The dip is not known, for the pit is lull of water. It 
