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Anderson takes us on a journey backward into time to explore Iowa's rock-and-sediment record. In the distant past, prehistoric Iowa was covered with shallow seas; coniferous forests flourished in areas beyond the continental glaciers; and a wide variety of animals existed, including mastodon, mammoth, musk ox, giant beaver, camel, and giant sloth.
The presence of humans can be traced back to the Paleo-Indian interval, 9,500 to 7,500 years ago. Iowa in Paleozoic time experienced numerous coastal plain and shallow marine environments. Early in the Precambrian, Iowa was part of ancient mountain belts in which granite and other rocks were formed well below the earth's surface.
The hills and valleys of the Hawkeye State are not everlasting when viewed from the perspective of geologic time. Overall, Iowa's geologic column records an extraordinary transformation over more than three billion years. Wayne Anderson's profusely illustrated volume provides a comprehensive andaccessible survey of the state's remarkable geological past.
|1||The Geologic Setting of Iowa||1|
|2||Precambrian: The Oldest Rocks||16|
|3||Cambrian: Sandy Marine Shelves and Shorelines||48|
|4||Ordovician: Warm, Shallow Seas||65|
|5||Silurian: Dolomite and Carbonate Mounds||106|
|6||Devonian: A Variety of Marine Deposits||136|
|7||Mississippian: Last of the Widespread Carbonate Seas||180|
|8||Pennsylvanian: Coastal Swamps and Shallow Seas||227|
|9||Mesozoic: Evaporite Deposits and the Last of the Inland Seas||270|
|10||Cenozoic: Erosion Climaxed by the Great Ice Age||303|
|11||Geology and Humankind||353|