Add to ORKGThe sandstones under consideration lie in old gorges in Devonian limestone a short distance north of Iowa City. On account of the presence of plant remains, which, however, were too fragmentary for identification, Hall regarded the arenaceous deposits as belonging to the upper coal measures. Others visiting the places, since the announcement of the discovery in 1858, have adopted the same view as to the age of the rock without attempting to question the correctness of the assumption, or to obtain further evidence
The section is located on the line of the Wabash railway about two miles below the little station of...
The great Devonic limestone succession in Iowa was long treated as if it were a single stratigraphic...
Notwithstanding the facts that it was in Iowa rocks of Cretaceous age were first recognized in this ...
In examining the rock exposures in a quarry near the village of Robins, Linn County, Iowa, Mr. R. B....
The sandstone of Redrock, in Marion County, Iowa, has long attracted popular attention. The bright v...
At Bertram in Linn county and at Canton in Jackson county are found deposits of sandstone, shale and...
Two beds of limestone, each 12-13 feet thick, above the DeKalb, are exposed in Gordon\u27s Hollow, o...
Several years ago while studying the coal measures of Iowa and the neighboring states, it was sugges...
Of late, stratigraphic taxonomy and correlation take on new trend from that to which the last genera...
In the process of road-making west of Middle Amana, in 1931, the grader exposed the country rock ben...
Until recently little definite information has been accessible concerning the distribution and subdi...
At the state quarries, or North Bend quarries, in sections 5 and 8 of Penn township, Johnson County,...
The most important geological discovery in Iowa in recent years is the revelation that our Devonic d...
Of all of Iowa\u27s geological formations the Dodge gypsum has held out longest and most resolutely ...
The section is located on the line of the Wabash railway about two miles below the little station of...
The great Devonic limestone succession in Iowa was long treated as if it were a single stratigraphic...
Notwithstanding the facts that it was in Iowa rocks of Cretaceous age were first recognized in this ...
In examining the rock exposures in a quarry near the village of Robins, Linn County, Iowa, Mr. R. B....
The sandstone of Redrock, in Marion County, Iowa, has long attracted popular attention. The bright v...
At Bertram in Linn county and at Canton in Jackson county are found deposits of sandstone, shale and...
Two beds of limestone, each 12-13 feet thick, above the DeKalb, are exposed in Gordon\u27s Hollow, o...
Several years ago while studying the coal measures of Iowa and the neighboring states, it was sugges...
Of late, stratigraphic taxonomy and correlation take on new trend from that to which the last genera...
In the process of road-making west of Middle Amana, in 1931, the grader exposed the country rock ben...
Until recently little definite information has been accessible concerning the distribution and subdi...
At the state quarries, or North Bend quarries, in sections 5 and 8 of Penn township, Johnson County,...
The most important geological discovery in Iowa in recent years is the revelation that our Devonic d...
Of all of Iowa\u27s geological formations the Dodge gypsum has held out longest and most resolutely ...
The section is located on the line of the Wabash railway about two miles below the little station of...
The great Devonic limestone succession in Iowa was long treated as if it were a single stratigraphic...
Notwithstanding the facts that it was in Iowa rocks of Cretaceous age were first recognized in this ...