Add to ORKGFor several reasons the section of Cretacic strata in northwestern Iowa is of especial interest. It was in this section, near the mouth of the Big Sioux River, that for the first time in the New World the stratigraphic equivalents of the English Cretacic formations were clearly recognized. In this section true chalk, made up of countless myriads of microscopic organic remains, was first discovered in this country. This section is also a part of the classic locality for the Mid-Cretacic formations of America
In all the Mississippi valley there is no geologic formation that is so misunderstood, or so illy co...
The Cretaceous deposits of Iowa, from time to time, have received the attention of a number of geolo...
In the consideration of the broader taxonomic aspects of the general geologic section of the rocks o...
For several reasons the section of Cretacic strata in northwestern Iowa is of especial interest. It ...
With the larger perspective of the Cretaceous formations recently opened out to the west of us, betw...
As a terranal name Lake Valley is applied to a remarkable blue limestone occurring at the famous sil...
At the state quarries, or North Bend quarries, in sections 5 and 8 of Penn township, Johnson County,...
The great Devonic limestone succession in Iowa was long treated as if it were a single stratigraphic...
Until recently little definite information has been accessible concerning the distribution and subdi...
Notwithstanding the facts that it was in Iowa rocks of Cretaceous age were first recognized in this ...
The purpose of this paper is to show the stratigraphic relations of the Greenhorn and Niobrara forma...
Except they be trained geologists few Iowans there are who would ordinarily think of looking for mou...
While making a study of the Keokuk beds in southeastern Iowa during the field season of 1911, the wr...
Familial diversity of crinoids is relatively constant throughout the Missourian Series of southeaste...
The lithology of certain Benton (?) strata in Lyon County and adjacent parts of Minnehaha County, So...
In all the Mississippi valley there is no geologic formation that is so misunderstood, or so illy co...
The Cretaceous deposits of Iowa, from time to time, have received the attention of a number of geolo...
In the consideration of the broader taxonomic aspects of the general geologic section of the rocks o...
For several reasons the section of Cretacic strata in northwestern Iowa is of especial interest. It ...
With the larger perspective of the Cretaceous formations recently opened out to the west of us, betw...
As a terranal name Lake Valley is applied to a remarkable blue limestone occurring at the famous sil...
At the state quarries, or North Bend quarries, in sections 5 and 8 of Penn township, Johnson County,...
The great Devonic limestone succession in Iowa was long treated as if it were a single stratigraphic...
Until recently little definite information has been accessible concerning the distribution and subdi...
Notwithstanding the facts that it was in Iowa rocks of Cretaceous age were first recognized in this ...
The purpose of this paper is to show the stratigraphic relations of the Greenhorn and Niobrara forma...
Except they be trained geologists few Iowans there are who would ordinarily think of looking for mou...
While making a study of the Keokuk beds in southeastern Iowa during the field season of 1911, the wr...
Familial diversity of crinoids is relatively constant throughout the Missourian Series of southeaste...
The lithology of certain Benton (?) strata in Lyon County and adjacent parts of Minnehaha County, So...
In all the Mississippi valley there is no geologic formation that is so misunderstood, or so illy co...
The Cretaceous deposits of Iowa, from time to time, have received the attention of a number of geolo...
In the consideration of the broader taxonomic aspects of the general geologic section of the rocks o...