Add to ORKGThe lithology of certain Benton (?) strata in Lyon County and adjacent parts of Minnehaha County, South Dakota is described. These rocks differ greatly from the common type of limestone and chalk of the Cretaceous of the Big Sioux and Missouri River region. The formation contains large quantities of siliceous material in the matrix and as spicules and in some beds as chert. Fragments of glass are common in one zone
The long period intervening between the deposit of the Cretaceous rocks of Iowa and the advent of th...
Meek and Hayden\u27s type-section of the Cretaceous Dakota sandstone is directly across the Missouri...
A layer of Wisconsin drift ranging up to 150 feet in thickness mantles the better part of the bedroc...
The lithology of certain Benton (?) strata in Lyon County and adjacent parts of Minnehaha County, So...
The several major and many more minor recessional moraines are discussed with respect to their locat...
Notwithstanding the facts that it was in Iowa rocks of Cretaceous age were first recognized in this ...
The Cretaceous deposits of Iowa, from time to time, have received the attention of a number of geolo...
Until recently little definite information has been accessible concerning the distribution and subdi...
The locations, structure and meteorologic conditions favorable to forming ice and to its wasting awa...
During the summer of 1936 a well was drilled for a municipal water supply at Larchwood, Lyon County....
The existing geological maps of Iowa show a continuous blanket of Cretaceous rocks underlying the gl...
The Cretaceous system in Iowa is composed of shales, argillaceous limestones and sandstone, and argi...
With the larger perspective of the Cretaceous formations recently opened out to the west of us, betw...
The long period intervening between the deposit of the Cretaceous rocks of Iowa and the advent of th...
Meek and Hayden\u27s type-section of the Cretaceous Dakota sandstone is directly across the Missouri...
A layer of Wisconsin drift ranging up to 150 feet in thickness mantles the better part of the bedroc...
The lithology of certain Benton (?) strata in Lyon County and adjacent parts of Minnehaha County, So...
The several major and many more minor recessional moraines are discussed with respect to their locat...
Notwithstanding the facts that it was in Iowa rocks of Cretaceous age were first recognized in this ...
The Cretaceous deposits of Iowa, from time to time, have received the attention of a number of geolo...
Until recently little definite information has been accessible concerning the distribution and subdi...
The locations, structure and meteorologic conditions favorable to forming ice and to its wasting awa...
During the summer of 1936 a well was drilled for a municipal water supply at Larchwood, Lyon County....
The existing geological maps of Iowa show a continuous blanket of Cretaceous rocks underlying the gl...
The Cretaceous system in Iowa is composed of shales, argillaceous limestones and sandstone, and argi...
With the larger perspective of the Cretaceous formations recently opened out to the west of us, betw...
The long period intervening between the deposit of the Cretaceous rocks of Iowa and the advent of th...
Meek and Hayden\u27s type-section of the Cretaceous Dakota sandstone is directly across the Missouri...
A layer of Wisconsin drift ranging up to 150 feet in thickness mantles the better part of the bedroc...