Add to ORKGFormational units of the Meramec Series are present only in the southwestern portion and along the s...
Cover title."Reprinted from the Transactions, Illinois State Academy of Science, vol. 31, no. 2, pp....
Estimates of strippable coal reserves were made for 12 counties in south-central Iowa, for the purpo...
The Pennsylvanian System in Iowa includes strata ranging from Morrowan to Virgilian in age. Based pr...
The nomenclatural history of some Upper Cherokee coals of Iowa is reviewed, beginning with the 1870 ...
One phase of the inapplicability of the unfortunate title of Pennsylvanian as sometimes used for our...
Late studies of the Mississippian formations of southeastern Iowa for the Iowa Geological Survey hav...
In its broader, or continental, relationships, the chronologic position of our Iowa Productive coal ...
This is a guidebook for field conference of a culmination of a long series of cooperative investigat...
The geological location of the Ledges in the state, the kinds of rock found there and their arrangem...
The exposed stratified rocks of central Iowa are made up chiefly of Lower Coal Measure clays, shales...
In the general section of the coal measures of Iowa, Missouri and Kansas there are two unconformitie...
ABSTRACT: Previous studies have shown that coal over-lain by a thick sequence of nonmarine strata is...
Iowa geologists have long experienced great difficulty in isolating good key beds in the younger Pen...
For a long time it has been known that in Iowa and the neighboring states to the south a break in se...
Formational units of the Meramec Series are present only in the southwestern portion and along the s...
Cover title."Reprinted from the Transactions, Illinois State Academy of Science, vol. 31, no. 2, pp....
Estimates of strippable coal reserves were made for 12 counties in south-central Iowa, for the purpo...
The Pennsylvanian System in Iowa includes strata ranging from Morrowan to Virgilian in age. Based pr...
The nomenclatural history of some Upper Cherokee coals of Iowa is reviewed, beginning with the 1870 ...
One phase of the inapplicability of the unfortunate title of Pennsylvanian as sometimes used for our...
Late studies of the Mississippian formations of southeastern Iowa for the Iowa Geological Survey hav...
In its broader, or continental, relationships, the chronologic position of our Iowa Productive coal ...
This is a guidebook for field conference of a culmination of a long series of cooperative investigat...
The geological location of the Ledges in the state, the kinds of rock found there and their arrangem...
The exposed stratified rocks of central Iowa are made up chiefly of Lower Coal Measure clays, shales...
In the general section of the coal measures of Iowa, Missouri and Kansas there are two unconformitie...
ABSTRACT: Previous studies have shown that coal over-lain by a thick sequence of nonmarine strata is...
Iowa geologists have long experienced great difficulty in isolating good key beds in the younger Pen...
For a long time it has been known that in Iowa and the neighboring states to the south a break in se...
Formational units of the Meramec Series are present only in the southwestern portion and along the s...
Cover title."Reprinted from the Transactions, Illinois State Academy of Science, vol. 31, no. 2, pp....
Estimates of strippable coal reserves were made for 12 counties in south-central Iowa, for the purpo...