Add to ORKGSamples of carbonaceous material from several exposures of the Cedar Valley formation have been studied in order to establish a basis for calling the material a coal. Examination has shown that the material is a cannel\u27\u27 coal, and it is believed to be one of the earliest known coals in North America
Estimates of strippable coal reserves were made for 12 counties in south-central Iowa, for the purpo...
The nomenclatural history of some Upper Cherokee coals of Iowa is reviewed, beginning with the 1870 ...
At a horizon of some hundred feet above the base of the Coal Measures in Fairfield Township in Jeffe...
Samples of carbonaceous material from several exposures of the Cedar Valley formation have been stud...
The district at hand is one somewhat remote from any known field of productive Coal Measures, but be...
Preparation of a report by the writer on the Geology of Adams County for the Iowa Geological Surve...
The rock formations of Linn County belong to the Devonian period. During an examination with the pos...
The chemistry department of Iowa Wesleyan College first began a preliminary chemical analysis on som...
This report on coal is a more comprehensive report. The report discussed distribution, the geologica...
A stratigraphic study of the plant microfossils m the Iowa Pennsylvanian coals by the maceration met...
Recent analysis of an abundant coal flora dislodged from coalballs,\u27\u27 or sulphur balls of t...
21. Coal measures Nearly all of Poweshiek County is covered by loess and drift to such a depth that ...
Estimates of strippable coal reserves were made for 12 counties in south-central Iowa, for the purpo...
The nomenclatural history of some Upper Cherokee coals of Iowa is reviewed, beginning with the 1870 ...
At a horizon of some hundred feet above the base of the Coal Measures in Fairfield Township in Jeffe...
Samples of carbonaceous material from several exposures of the Cedar Valley formation have been stud...
The district at hand is one somewhat remote from any known field of productive Coal Measures, but be...
Preparation of a report by the writer on the Geology of Adams County for the Iowa Geological Surve...
The rock formations of Linn County belong to the Devonian period. During an examination with the pos...
The chemistry department of Iowa Wesleyan College first began a preliminary chemical analysis on som...
This report on coal is a more comprehensive report. The report discussed distribution, the geologica...
A stratigraphic study of the plant microfossils m the Iowa Pennsylvanian coals by the maceration met...
Recent analysis of an abundant coal flora dislodged from coalballs,\u27\u27 or sulphur balls of t...
21. Coal measures Nearly all of Poweshiek County is covered by loess and drift to such a depth that ...
Estimates of strippable coal reserves were made for 12 counties in south-central Iowa, for the purpo...
The nomenclatural history of some Upper Cherokee coals of Iowa is reviewed, beginning with the 1870 ...
At a horizon of some hundred feet above the base of the Coal Measures in Fairfield Township in Jeffe...