Geomorphology and Quarternary Geologic History of the Lower Mississippi Valley


Book Description

This comprehensive, two-volume synthesis, the first in 50 years, is aimed at a multidisciplinary audience concerned with multiple aspects of water resources engineering and natural and cultural resources management. It presents at a scale of 1:250,000 the distribution of environments of deposition as compiled from more than 30 years of detailed geologic mapping, as well as a new interpretation and delineation of the eroded suballuvial surface. A detailed interpretation of the evolution of the alluvial valley and deltaic plain is presented and illustrated by a series of 13 paleogeographic reconstructions. The chronology of valley events is based on stratigraphic relationships and radiometric age determinations but relies heavily on archeological evidence. The geologic processes and controls that affect the entire region include continental glaciations, climate, sea level variations, tectonics and diapirism, and subsidence. Both erosional and depositional landscapes are represented, and the lithology, soils, and geotechnical properties of the latter are presented in narrative and tabular form for the principal fluvial, lacustrine, eclian, deltaic, and deltaic-marine environments. Discussions of neotectonics in the region focus on the New Madrid Seismic Zone, and a section of the synthesis addresses special engineering considerations such as groundwater occurrence, mass movements, river meandering, and long-term stability. (AN).




Geomorphology and Quarternary Geologic History of the Lower Mississippi Valley


Book Description

This comprehensive, two-volume synthesis, the first in 50 years, is aimed at a multidisciplinary audience concerned with multiple aspects of water resources engineering and natural and cultural resources management. It presents at a scale of 1:250,000 the distribution of environments of deposition as compiled from more than 30 years of detailed geologic mapping, as well as a new interpretation and delineation of the eroded suballuvial surface. A detailed interpretation of the evolution of the alluvial valley and deltaic plain is presented and illustrated by a series of 13 paleogeographic reconstructions. The chronology of valley events is based on stratigraphic relationships and radiometric age determinations but relies heavily on archeological evidence. The geologic processes and controls that affect the entire region include continental glaciations, climate, sea level variations, tectonics and diapirism, and subsidence. Both erosional and depositional landscapes are represented, and the lithology, soils, and geotechnical properties of the latter are presented in narrative and tabular form for the principal fluvial, lacustrine, eolian, deltaic, and deltaic-marine environments. Discussions of neotectonics in the region focus on the New Madrid Seismic Zone, and a section of the synthesis addresses special engineering considerations such as groundwater occurrence, mass movements, river meandering, and long-term stability. (AN).










Defining the Delta


Book Description

Inspired by the Arkansas Review’s “What Is the Delta?” series of articles, Defining the Delta collects fifteen essays from scholars in the sciences, social sciences, and humanities to describe and define this important region. Here are essays examining the Delta’s physical properties, boundaries, and climate from a geologist, archeologist, and environmental historian. The Delta is also viewed through the lens of the social sciences and humanities—historians, folklorists, and others studying the connection between the land and its people, in particular the importance of agriculture and the culture of the area, especially music, literature, and food. Every turn of the page reveals another way of seeing the seven-state region that is bisected by and dependent on the Mississippi River, suggesting ultimately that there are myriad ways of looking at, and defining, the Delta.







Mississippian Community Organization


Book Description

The Powers Phase Project was a multiyear archaeological program undertaken in southeastern Missouri by the University of Michigan in the late 1960s and early 1970s. The project focused on the occupation of a large Pleistocene-age terrace in the Little Black River Lowland—a large expanse of lowlying land just east of the Ozark Highland—between roughly A. D. 1250 and A. D. 1400. The largest site in the region is Powers Fort—a palisaded mound center that - ceived archaeological attention as early as the late nineteenth century. Archa- logical surveys conducted south of Powers Fort in the 1960s revealed the pr- ence of numerous smaller sites of varying size that contained artifact assemblages similar to those from the larger center. Collectively the settlement aggregation became known as the Powers phase. Test excavations indicated that at least some of the smaller sites contained burned structures and that the burning had sealed household items on the floors below the collapsed architectural e- ments. Thus there appeared to be an opportunity to examine a late prehistoric settlement system to a degree not possible previously. Not only could the s- tial relation of communities in the system be ascertained, but the fact that str- tures within the communities had burned appeared to provide a unique opp- tunity to examine such things as differences in household items between and among structures and where various activities had occurred within a house. With these ideas in mind, James B. Griffin and James E.