Add to ORKGThe Cretaceous system in Iowa is composed of shales, argillaceous limestones and sandstone, and argillaceous sandstones. The former are generally referred to the Fort Benton horizon of the Colorado, while the latter are placed with the Dakota
In connection with a casual reference to the cenological features of Central Iowa mention may be mad...
During the last year work on the geology of southwestern Iowa has been continued. The different outc...
Two beds of limestone, each 12-13 feet thick, above the DeKalb, are exposed in Gordon\u27s Hollow, o...
The Cretaceous system in Iowa is composed of shales, argillaceous limestones and sandstone, and argi...
Notwithstanding the facts that it was in Iowa rocks of Cretaceous age were first recognized in this ...
Until recently little definite information has been accessible concerning the distribution and subdi...
A layer of Wisconsin drift ranging up to 150 feet in thickness mantles the better part of the bedroc...
The Cretaceous deposits of Iowa, from time to time, have received the attention of a number of geolo...
With the larger perspective of the Cretaceous formations recently opened out to the west of us, betw...
The lithology of certain Benton (?) strata in Lyon County and adjacent parts of Minnehaha County, So...
Meek and Hayden\u27s type-section of the Cretaceous Dakota sandstone is directly across the Missouri...
The existing geological maps of Iowa show a continuous blanket of Cretaceous rocks underlying the gl...
The long period intervening between the deposit of the Cretaceous rocks of Iowa and the advent of th...
In connection with a casual reference to the cenological features of Central Iowa mention may be mad...
During the last year work on the geology of southwestern Iowa has been continued. The different outc...
Two beds of limestone, each 12-13 feet thick, above the DeKalb, are exposed in Gordon\u27s Hollow, o...
The Cretaceous system in Iowa is composed of shales, argillaceous limestones and sandstone, and argi...
Notwithstanding the facts that it was in Iowa rocks of Cretaceous age were first recognized in this ...
Until recently little definite information has been accessible concerning the distribution and subdi...
A layer of Wisconsin drift ranging up to 150 feet in thickness mantles the better part of the bedroc...
The Cretaceous deposits of Iowa, from time to time, have received the attention of a number of geolo...
With the larger perspective of the Cretaceous formations recently opened out to the west of us, betw...
The lithology of certain Benton (?) strata in Lyon County and adjacent parts of Minnehaha County, So...
Meek and Hayden\u27s type-section of the Cretaceous Dakota sandstone is directly across the Missouri...
The existing geological maps of Iowa show a continuous blanket of Cretaceous rocks underlying the gl...
The long period intervening between the deposit of the Cretaceous rocks of Iowa and the advent of th...
In connection with a casual reference to the cenological features of Central Iowa mention may be mad...
During the last year work on the geology of southwestern Iowa has been continued. The different outc...
Two beds of limestone, each 12-13 feet thick, above the DeKalb, are exposed in Gordon\u27s Hollow, o...
