Upper Paleocene and lowermost Eocene angiosperm pollen biostratigraphy of the eastern Gulf Coast and Virginia

摘要: Strata comprising most of the upper Paleocene in eastern North America are divided into two new pollen zones, Carya and Platycaryaplatycaryoides Interval Zones. Pollen data have proven to be important for correlations between Alabama-western Georgia Mississippi Gulf Coast Virginia. Migration tropical plant taxa from Caribbean began at least 4 m.y. before end Paleocene. The Terminal Extinction Event, accompanied by a distinct pulse immigration Europe, several hundred thousand years INTRODUCTION Correlation coastal terrestrial lower Tertiary strata is difficult because marine fossils sparse or lacking. biostratigraphy an excellent method correlation strata, but it highly desirable calibrate using standard nannoand microfossil zonations. ideal region creating calibrated this pollen-rich interstratified with pollen-bearing rich calcareous nannofossils microfossils. purpose paper (1) compile composite pollenstratigraphic section (Composite Section A) Alabama western Georgia, based on outcrop core samples, including many samples; (2) means published nannofossil age determinations strata; (3) examine assemblages cored sections Mississippi, comparing these Georgia; (4) combine all create pollen-stratigraphic B); (5) correlate those Oak Grove Virginia previously that (text-fig. 1). During course investigation, were obtained about immigrations Europe taxon extinctions near Appendix 1 provides geographic stratigraphic information 59 samples whose main source paper. Sample localities shown text-figure 2. PREVIOUS POLLEN WORK Papers (including Embayment central Georgia) been Fairchild Elsik (1969), Tschudy (1973a, 1973b, 1975), Patterson (1975), Christopher et al. (1980), Frederiksen (1980a, 1980b, 1991), Cofer (1982), (1982). This completes summary research was begun my article 1991 Midwayan Provincial Stage, which includes Clayton Formation, Porters Creek Clay, Naheola Formation correlatives Atlantic Coastal Plain; rocks equivalent Danian part Selandian European Stages, lowermost emphasis here Nanafalia Tuscahoma Formations, representing Selandian(?) Thanetian Stages Sabinian Stage. draws together mainly I examined can placed reasonably accurate levels. Some (Frederiksen 1980a, 1991; 1982), discussed new. At 80 angiosperm known Formations Coast; they listed table 1. Most well illustrated papers early palynology United States. However, some also (plates 1-2). having restricted ranges, defined as do not range both above below combined Formations. LITHOSTRATIGRAPHIC AND CHRONOSTRATIGRAPHIC UNITS Murray (1955) certain Eocene 3). base Stage region. boundary overlying "Ostrea thirsae beds" he de cribed forming Marthaville T xas Louisiana (Mississippi, Alabama, Georgia). provincial stage micropaleontology, vol. 44, no. 1, pp. 45-68, text-figures 1-14, plates 1-2, 1998 45 content downloaded 207.46.13.113 Wed, 05 Oct 2016 04:41:44 UTC All use subject http://about.jstor.org/terms Norman 0. Frederiksen: Upper