Add to ORKGIn Iowa, with our nearly 500 feet of Devonian sediments, we are not apt to think very much about a possibility of the lack of this great system soon after the boundaries of our state are passed. Yet the possibility is an actuality. In west-central Missouri it has been lately found that no rocks of Devonian age are represented. The lower Carboniferous strata rests directly upon Ordovician dolomites
The Devonian-Carboniferous boundary in the type area of the Mississippian subsystem (tri-state area ...
Conodonts are rare in the Shell Rock Formation, but they support the previous assignment of this for...
These microfossils were found in screenings obtained by washing some marly shales from the Cerro Gor...
In Iowa, with our nearly 500 feet of Devonian sediments, we are not apt to think very much about a p...
When the present Iowa Geological Survey first began operations, 30 odd years ago, one of the surpris...
The most important geological discovery in Iowa in recent years is the revelation that our Devonic d...
The Devonian System, in Iowa, is exposed in a belt about 50 miles wide extending along a line from M...
It is a well-known characteristic of the Devonian limestones that to an extraordinary degree they ha...
The great Devonic limestone succession in Iowa was long treated as if it were a single stratigraphic...
For a long time it has been known that in Iowa and the neighboring states to the south a break in se...
In a report recently made to the State Geological Survey, the writer communicates in detail some fac...
The exact stratigraphic relations of, and the exact boundary line between, the latest Devonic format...
At Bertram in Linn county and at Canton in Jackson county are found deposits of sandstone, shale and...
This is the first of a two-part report dealing primarily with the Devonian strata in the subsurface ...
The Devonian-Carboniferous boundary in the type area of the Mississippian subsystem (tri-state area ...
Conodonts are rare in the Shell Rock Formation, but they support the previous assignment of this for...
These microfossils were found in screenings obtained by washing some marly shales from the Cerro Gor...
In Iowa, with our nearly 500 feet of Devonian sediments, we are not apt to think very much about a p...
When the present Iowa Geological Survey first began operations, 30 odd years ago, one of the surpris...
The most important geological discovery in Iowa in recent years is the revelation that our Devonic d...
The Devonian System, in Iowa, is exposed in a belt about 50 miles wide extending along a line from M...
It is a well-known characteristic of the Devonian limestones that to an extraordinary degree they ha...
The great Devonic limestone succession in Iowa was long treated as if it were a single stratigraphic...
For a long time it has been known that in Iowa and the neighboring states to the south a break in se...
In a report recently made to the State Geological Survey, the writer communicates in detail some fac...
The exact stratigraphic relations of, and the exact boundary line between, the latest Devonic format...
At Bertram in Linn county and at Canton in Jackson county are found deposits of sandstone, shale and...
This is the first of a two-part report dealing primarily with the Devonian strata in the subsurface ...
The Devonian-Carboniferous boundary in the type area of the Mississippian subsystem (tri-state area ...
Conodonts are rare in the Shell Rock Formation, but they support the previous assignment of this for...
These microfossils were found in screenings obtained by washing some marly shales from the Cerro Gor...