Neogene Palynostratigraphy of the Southern Mexico Margin, DSDP Leg 66
Published:January 01, 1982
Continuous analysis of 623.5 m of cored samples from the three holes at Site 493 resulted in the recognition of eight distinctive palynostratigraphic zones and three unconformities. The early Miocene to the Holocene assemblage succession documents vegetation changes on the mainland in the last 20 million years. Vegetational shifts are due in part to climatic fluctuations that occurred in the region. Correlation with the nannoplankton zonation and magnetostratigraphy is fair to good.
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Studies in Continental Margin Geology
"Studies in Continental Margin Geology" contains papers from a research conference co-sponsored by AAPG and the University of Texas Institute for Geophysics held in Galveston, Texas in 1981. Rapid advances in the understanding of continental margin geology were taking place during the time period, based on major improvements in the quality and availability of regional seismic surveys plus other fields such as organic geochemistry. For the first time it was becoming common to have a visual characterization of tectonic processes at significant depths below the surface. Twenty-seven papers are presented that deal with field investigations of continental margin structure and stratigraphy. The geographic areas of study are global in nature and many of the descriptive results are derived from modern seismic investigations in areas where that type of data had not previously been available in commercial publications. Fifteen of the papers focus on rifted margins and the other twelve concern convergent margins. Twelve papers are model investigations of a variety of margin environmental processes, related to subjects such as depositional environments, biostratigraphy, organic matter deposition, and oil and gas occurrences as a function of the plate tectonic setting. An additional nine papers model the thermal and mechanical tectonic processes involved in the structural development along continental margins.