Diatom stratigraphy of the lower Pliocene part of the Sisquoc Formation, Harris Grade section, California
Diatom stratigraphy of the lower Pliocene part of the Sisquoc Formation, Harris Grade section, California
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加利福尼亚州哈里斯级剖面 Sisquoc 组下新世部分的硅藻地层
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发表时间：
1986
期刊：
影响因子：
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通讯作者：
J. Baldauf
中科院分区：
文献类型：
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作者：
J. Barron;J. Baldauf
研究了加利福尼亚Lompoc北部沿Harris Grade暴露的Sisquoc组和Foxen泥岩下部上新世硅藻，以完善加利福尼亚后monterey组沉积物的硅藻生物地层学。在790米厚（2950英尺）剖面的25个样本中鉴定出67个硅藻类群。硅藻可归属于Barron（1981）的最上层reinholdii Nitzschia Zone和thalassisira oestrupii Zone，并提出了5个局部相关的暂定亚带。讨论了区域相关性和分类群发生情况，并将莱茵霍尔德尼氏线虫带的基点重新定义为施拉氏Thalassionema最后一次发生的时间。
Lower Pliocene diatoms were studied from the Sisquoc Formation and lowermost Foxen Mudstone, exposed along Harris Grade north of Lompoc, California, to refine the diatom biostratigraphy of post-Monterey Formation sediments in California. Sixty-seven diatom taxa were identified in the 25 samples examined from the 790-m thick (2950-ft) section. The diatoms are assignable to the uppermost Nitzschia reinholdii Zone and Thalassiosira oestrupii Zone of Barron (1981), and five tentative subzones for local correlation are proposed. Regional correlations and taxon occurrence are discussed, and the base of the Nitzschia reinholdii Zone is redefined as at the last occurrence of Thalassionema schraderi.