Records four prograding cycles of estuarine deposition for the past 8230 + or - 100 years. Analyses of texture, mineralogy, paleontology, and sedimentary structures enable definition of eight lithologic units. Mineralogic studies show that past and present sedimentation at Portage has been largely mud and sand from the Susitna River on the NW side of Cook Inlet. Sedimentation rates for four intervals show rates to be higher and to vary more at depth than rates nearer the surface. Presently, deposition is accomplished 'instantly' as the result of tectonic subsidence and compaction of sediment caused by periodic earthquakes, in combination with a turbid estuarine system. -from Authors
Additional Publication Details
Holocene history of the estuarine area surrounding Portage, Alaska, as recorded in a 93 m core.