Benthic Foraminiferal and Sedimentologic Changes in the Pliocene Yorktown Formation, Virginia, USA

IF 0.9 4区 地球科学 Q4 PALEONTOLOGY
W. Spivey, S. Culver, D. Mallinson, H. Dowsett, M. Buzas
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引用次数: 0

Abstract

The Pliocene Yorktown Formation consists of four lithologic units that record three marine transgressive sequences along the U.S. mid-Atlantic margin. These units were deposited during a time when average sea-level and mean global temperatures were ∼25 m and ∼3°C higher than the pre-industrial, respectively, and global atmospheric CO2 concentrations were similar to present. Forty-five samples were collected along the James River near Rushmere, Virginia, and Spring Grove, Virginia, and were analyzed for benthic foraminifera community and sedimentological changes between each member of the formation. These data are useful for developing boundary conditions for shallow, near-shore environments for paleoclimate modeling. Foraminiferal analysis distinguishes six biofacies across the entire formation. The most notable change in grain-size occurs at the conformable boundary between the Rushmere and Morgarts Beach members, where the average percentage of sand decreases from ∼60% in the Rushmere Member to <40% in the Morgarts Beach Member.
美国弗吉尼亚州上新世约克镇组的底栖有孔虫和沉积学变化
上新世约克镇组由四个岩性单元组成,记录了沿美国大西洋中缘的三个海侵层序。这些单元是在平均海平面和全球平均温度分别比工业化前高~ 25 m和~ 3°C,全球大气CO2浓度与现在相似的时期沉积的。在弗吉尼亚州拉什米尔和斯普林斯格罗夫附近的詹姆斯河沿岸收集了45个样本,并分析了底栖有孔虫群落和每个地层成员之间的沉积学变化。这些数据有助于为古气候模拟开发浅海、近岸环境的边界条件。有孔虫分析区分了整个地层的6种生物相。最显著的粒度变化发生在拉什米尔和摩根茨海滩成员之间的整合边界,其中沙的平均百分比从拉什米尔成员的约60%减少到摩根茨海滩成员的<40%。
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来源期刊
Journal of Foraminiferal Research
Journal of Foraminiferal Research 地学-古生物学
CiteScore
2.10
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.
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