A geoarchaeological perspective on the challenges and trajectories of Mississippi Delta communities
A geoarchaeological perspective on the challenges and trajectories of Mississippi Delta communities
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DOI：
10.1016/j.geomorph.2020.107132
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发表时间：
2020-03
期刊：
影响因子：
3.9
通讯作者：
E. Chamberlain;J. Mehta;T. Reimann;J. Wallinga
中科院分区：
文献类型：
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作者：
E. Chamberlain;J. Mehta;T. Reimann;J. Wallinga
美国路易斯安那州沿海的密西西比三角洲的最新地质年代学提供了土地生长的高分辨率记录，有助于研究与三角洲演变相关的古代定居模式。我们使用地层学和光释光（OSL）测年表明，两个晚全新世土丘建成后几百年的土地出现在开放的水域。这几个世纪的停顿允许自然过程的漫滩和决口splay沉积，以提高土地表面，减少洪水风险，并促进人类占领前理想的环境条件。这些结果适用于获得新的年龄限制，为大量的风险或丢失的考古遗址很少或没有绝对的年表。我们用我们的研究结果来评论史前，当代和未来的人类景观的相互作用在密西西比三角洲和其他三角洲环境。
Recent geochronology of the Mississippi Delta of coastal Louisiana, USA, provides a high-resolution record of land growth that facilitates the study of ancient settlement patterns in relation to delta evolution. We use stratigraphy and optically stimulated luminescence (OSL) dating to show that two Late Holocene earthen mounds were constructed several hundred years after the land emerged from open water. This multi-century pause allowed natural processes of overbank and crevasse splay deposition to elevate the land surface, reduce flood risk, and foster desirable environmental conditions prior to human occupation. These results are applied to obtain new age constraints for a large number of at-risk or lost archaeological sites with little-to-no absolute chronology. We use our findings to comment on prehistoric, contemporary, and future human-landscape interactions in the Mississippi Delta and other deltaic environments.