Geology and Natural History. 67 
have, subsequently, examined Cretaceous strata in Brown and 
Redwood counties, in southwestern Minnesota, where they rest 
unconformably upon rocks of Azoic age. So far as I am aware, 
these are the most easterly localities in the interior region of 
North America at which strata of Cretaceous age have been 
actually observed in situ. The first mentioned Cretaceous rocks 
are referred to the division which, in my report on the Geology 
of Iowa, I have named the Nisnabotany sandstone, and the latter 
to the division called the Inoceramus beds, in the same report. 
All these, as well as all the Cretaceous rocks hitherto know in the 
interior region, east m eastern Nebraska and Dakota, are 
referred to the “ Earlier Cretaceous” of Meek and Hayden. 
have now to announce discoveries of Cretaceous fossils, and 
at different localities containing specimens which belong to seve- 
ral of the most characteristic types of that period, especially of its 
later epochs. 
During the year 1870 my attention was called to the existence 
of these fossils in the drift of Howar county, Iowa, r. n 
T. Smith, of Lime Springs, and a few weeks ago I visited the local- 
ity indicated, in company with hi It is found in a railroad cut 
Ww * 
of the soil. The collections have not yet been critically studied, 
but the following statement of the one made at Lime Springs will 
in addition to the ammonite he found there a few years ago. e 
Belemnitella is of the same species as those found in Howard 
county, sixty miles directly northward. ae 
_the fish teeth have been submitted, for examination, to my 
— Prof. O. H. St. John, who writes me as follows concerning 
e€ 
“ All the squaloid teeth belong to the genus Otodus of Agassiz, 
may represent three species, but I suspect they are but so 
rms of peci 
; he ‘cit toma 
originally made known from the European chalk formation, 
with mr fin later Cretaceous and Tertiary teeth from this country 
