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"This volume brings together nineteen papers of interdisciplinary Quaternary science honoring Stephen Porter. Special Paper 548 features papers from six continents, on wide-ranging topics including glaciation, paleoecology, landscape evolution, megafloods, and loess. The topical and geographical range of the papers, as well as their interdisciplinary nature, honor Porter's distinct approach to Quaternary science and leadership that influence the field to this day"--
Taking advantage of new technological advances in Quaternary geology and geomorphology, this volume showcases new developments in glacial geology. Honoring the legacy of Frank Leverett and F.B. Taylor's 1915 USGS monograph of the region, this book includes 12 chapters that cover diverse topics ranging from hydrogeology, near-surface geophysics, geotectonics, and vertebrate paleontology to glacial geomorphology and glacial history. Several papers make use of detailed but nuanced shaded relief maps of digital elevation models of LiDAR data; these advances are brought into historical perspective by visiting the history of geologic mapping of Michigan. Looking forward, interpretations of the shaded relief maps evoke novel processes, such as regional evolution of subglacial and supraglacial drainage systems of receding glacial margins. The volume also includes assessment of chronological issues in light of greater accuracy and precision of radiocarbon dating of plant fossils using accelerator mass spectrometry versus older techniques.
The landscape of the Calumet, an area that sits astride the Indiana-Illinois state line at the southern end of Lake Michigan was shaped by the glaciers that withdrew toward the end of the last ice age--about 45,000 years ago. In the years since, many natural forces, including wind, running water, and the waves of Lake Michigan, have continued to shape the land. The lake's modern and ancient shorelines have served as Indian trails, stagecoach routes, highways, and sites that have evolved into many of the cities, towns, and villages of the Calumet area. People have also left their mark on the landscape: Indians built mounds; farmers filled in wetlands; governments commissioned ditches and canals to drain marshes and change the direction of rivers; sand was hauled from where it was plentiful to where it was needed for urban and industrial growth. These thousands of years of weather and movements of peoples have given the Calumet region its distinct climate and appeal.