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All News and Pages Related to "Iowa"

Erratics: Glacial Boulders in Iowa

Posted on August 13th, 2014

by Raymond R. Anderson and Jean Cutler Prior “Peculiar,” “irregular,” and “uncommon,” are words used to describe one class of Iowa rocks — glacial boulders or “erratics.” Geologists define erratics as stones or boulders that have been carried from their place of origin by a glacier and then left stranded by melting ice on bedrock […]

Geodes

Posted on August 13th, 2014

by Brian J. Witzke Iowa geodes have long been objects of curiosity, their sparkling interiors containing some of the most beautiful crystals to be found anywhere in the Midwest. Although geodes are known from many localities around the world, one of the most productive and famous collecting regions is encompassed within a 35-mile radius of […]

Meteorites in Iowa

Posted on August 13th, 2014

The arrival of the first of Iowa’s historic meteorites at 2:50 p.m. on February 25, 1847, was announced with a great blast, described as sounding like the rolling of “distant thunder” followed by “three reports … in quick succession, like the firing of heavy cannon a half mile distant.” C.W. Irish, a civil engineer reported that the […]

Fossils in Iowa

Posted on August 12th, 2014

by Jean Cutler Prior Many people have their beginning interest in geology stimulated by finding fossils. Holding the shell of a sea-dwelling organism found in an Iowa rock, far from the nearest ocean, makes us think about the vast changes that have occurred over the Earth’s surface and the great length of geologic time that […]

Hadrosaurs, commonly known as duck-billed dinosaurs, occupied subtropical environments in the coastal lowlands of the central United States during the Cretaceous Period, about 100 million years ago.

Dinosaurs in Iowa

Posted on August 12th, 2014

by Brian J. Witzke Did dinosaurs once live in Iowa? The simple and unqualified answer is “Yes, without a doubt!” But the actual evidence for dinosaurs in Iowa is limited to only a few fossils. Dinosaur fossils have been found in several states adjoining Iowa (Nebraska, Minnesota, Missouri, South Dakota), and wandering dinosaurs would have […]

Trowbridge Hall

Posted on April 30th, 2014

The primary home of the Iowa Geological Survey is on the third floor of Trowbridge Hall on the main campus of the University of Iowa in Iowa City, IA.  Entering the building through the main entrance on the east side of the building from the T. Anne Cleary Walkway, head up the main stairs to the third […]

Mineral Resources

Posted on April 30th, 2014

Cutting dimiensonal stone in the Bealer Quarry circa 1906 near Cedar Valley in Cedar County. Photo from the Calvin image database. Iowa is richly endowed with a variety of rock resources suitable for building construction, and their utility is particularly well displayed in the early architectural heritage of our state. Although building stone is still […]