Planktonic foraminifera from the Lower Cretaceous of Rio Argos sections (southern Spain) and biostratigraphic implications
Planktonic foraminifera from the Lower Cretaceous of Rio Argos sections (southern Spain) and biostratigraphic implications
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里约阿尔戈斯剖面（西班牙南部）下白垩统的浮游有孔虫及其生物地层意义
DOI：
10.1006/cres.1994.1037
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
I. P. Silva
中科院分区：
文献类型：
--
作者：
R. Coccioni;I. P. Silva
摘要对西班牙南部卡拉瓦卡（Caravaca）阿尔戈斯河（Rio Argos）沿着早白垩世地层中的浮游有孔虫的研究表明，这一类群的多样性比以前认为的要早得多。与菊石的直接相关表明，在Valanginian早期的第一次多样化之后，在Barremian开始时，浮游有孔虫的丰度和物种数量显着增加。有10多个物种出现在该剖面的巴列姆阶上部。几个分类群的进化外观显示发生早于以前的记录。特别是Globigerinelloides出现在Valanginian晚期（G. gottisi），G. blowi和G. aptiense最早出现在巴列姆纪晚期早期，当时所有的Globigerinelloides都注册了一个顶点。Hedbergella similis，H. kuznetsodium和clavihedbergellids出现在早期Barremian，其次是一个新的多样化在早期Aptian。根据这些观察，提出了一个新的分区。
Abstract The study of planktonic foraminifera from the Lower Cretaceous succession along the Rio Argos (Caravaca, southern Spain) revealed that this group started to diversify much earlier than previously thought. Direct correlation with ammonites shows that, after the first diversification in the early Valanginian, planktonic foraminifera increased remarkably in abundance and number of species at the beginning of the Barremian. More than 10 species occur in the upper Barremian part of the section. The evolutionary appearance of several taxa is shown to have occurred earlier than previously recorded. In particular, the genus Globigerinelloides appeared in the late Valanginian ( G. gottisi ), with G. blowi and G. aptiense first occurring in the early late Barremian, when all Globigerinelloides registered an acme. Hedbergella similis, H. kuznetsovae , and the clavihedbergellids appeared in the early Barremian, followed by a new diversification in the early Aptian. Based on these observations, a new zonation is proposed.