Add to ORKGUntil very recently, geologists working in Iowa have been content to refer the various boulder clays represented in the state to two till sheets, a so called upper and lower, separated in many places by the forest beds of McGee, or in other localities by gravels, often in conjunction with a vegetal horizon, the Aftonian of Chamberlin
The interglacial deposits of northeastern Iowa embrace the peat and forest bed which has been known ...
Previous investigations in Pleistocene geology in Iowa have resulted in the development of the conce...
The gravels related to the Iowan glaciation of northeastern Iowa have been studied in the field and ...
he Aftonian deposits of southwestern Iowa have peculiar interest in that within the area is the type...
During the past summer the author made a series of observations, at the request of Prof. S. Calvin, ...
The observations from which these data were obtained were made in an excavation opened for the basem...
Many new exposures have been made by the Chicago, Milwaukee and St. Paul Railway in the reconstructi...
In making an excavation through a low ridge just east of Oelwein, in Fayette county, the workmen of ...
Organic remains in glacial drifts and interglacial deposits are relatively abundant in Iowa and serv...
Kansan till outcrops over approximately 25 percent of the surface area in southern Iowa. Most natura...
McGhee, in the map accompanying his Pleistocene History of Northeastern Iowa, makes the Upper Till ...
Just outside the limits of the growing town of Oelwein, Iowa, to the southeast, the Chicago Great We...
Union County already occupies a notable place in the annals of the Pleistocene geology of our State....
The long period intervening between the deposit of the Cretaceous rocks of Iowa and the advent of th...
The full extent of overlap of the Illinoian upon the Kansan has not been determined. It is certain t...
The interglacial deposits of northeastern Iowa embrace the peat and forest bed which has been known ...
Previous investigations in Pleistocene geology in Iowa have resulted in the development of the conce...
The gravels related to the Iowan glaciation of northeastern Iowa have been studied in the field and ...
he Aftonian deposits of southwestern Iowa have peculiar interest in that within the area is the type...
During the past summer the author made a series of observations, at the request of Prof. S. Calvin, ...
The observations from which these data were obtained were made in an excavation opened for the basem...
Many new exposures have been made by the Chicago, Milwaukee and St. Paul Railway in the reconstructi...
In making an excavation through a low ridge just east of Oelwein, in Fayette county, the workmen of ...
Organic remains in glacial drifts and interglacial deposits are relatively abundant in Iowa and serv...
Kansan till outcrops over approximately 25 percent of the surface area in southern Iowa. Most natura...
McGhee, in the map accompanying his Pleistocene History of Northeastern Iowa, makes the Upper Till ...
Just outside the limits of the growing town of Oelwein, Iowa, to the southeast, the Chicago Great We...
Union County already occupies a notable place in the annals of the Pleistocene geology of our State....
The long period intervening between the deposit of the Cretaceous rocks of Iowa and the advent of th...
The full extent of overlap of the Illinoian upon the Kansan has not been determined. It is certain t...
The interglacial deposits of northeastern Iowa embrace the peat and forest bed which has been known ...
Previous investigations in Pleistocene geology in Iowa have resulted in the development of the conce...
The gravels related to the Iowan glaciation of northeastern Iowa have been studied in the field and ...