哥伦比亚始新统圣哈辛托组始新统始新统始新统甲洞:形态与古环境意义

IF 0.8 4区地球科学 Q4 PALEONTOLOGY

Ichnos-An International Journal for Plant and Animal Traces Pub Date : 2020-04-02 DOI:10.1080/10420940.2019.1612391

Gabriel Mendoza-Rodríguez, L. Buatois, D. Rincón-Martínez, M. Mángano, C. Baumgartner‐Mora

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引用次数: 3

摘要

摘要ichnospecies Nummipera eocenica发生在thick-bedded,表格生物碎屑巨大砂岩上始新世圣哈辛托圣哈辛托褶皱带盆地形成,哥伦比亚。新第三纪始新世是一个垂直到倾斜的洞穴，局部呈圆锥形。所研究样品的衬砌结构由均匀分布的鳞状和包状结构组成，试验通常向洞壁倾斜，衬砌密实良好。洞穴填充物与宿主岩相同，是一种生物碎屑砂岩，含有丰富的双壳类碎屑。修正了该属的诊断，将所有具有透镜状到盘状特征的Rotaliana亚纲的代表都包括为穴居的组成部分。圣哈辛托组处于三角洲河口坝与碳酸盐岩台地沉积的过渡阶段。

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The armored burrow Nummipera eocenica from the upper Eocene San Jacinto Formation, Colombia: morphology and paleoenvironmental implications

Abstract The ichnospecies Nummipera eocenica occurs in thick-bedded, tabular bioclastic massive sandstone of the upper Eocene San Jacinto Formation in the San Jacinto Fold Belt Basin, Colombia. Nummipera eocenica is a vertical to oblique burrow locally displaying a conical shape. The lining structure of the specimens studied consists of uniformly distributed lepidocyclinids and operculinids, with tests typically dipping towards the burrow wall, and well-compacted lining. The burrow infill is identical to the host rock, a bioclastic sandstone with abundant bivalve fragments. The diagnosis of Nummipera is emended to include as components of burrow lining all representatives of the Subclass Rotaliana characterized by being lenticular to discoidal in shape. In the San Jacinto Formation, Nummipera eocenica is present in the transition between deltaic mouth-bar and carbonate platform deposits.

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来源期刊

Ichnos-An International Journal for Plant and Animal Traces PALEONTOLOGY-

CiteScore

2.50

自引率

12.50%

发文量

审稿时长

>12 weeks

期刊介绍： The foremost aim of Ichnos is to promote excellence in ichnologic research. Primary emphases center upon the ethologic and ecologic significance of tracemaking organisms; organism-substrate interrelationships; and the role of biogenic processes in environmental reconstruction, sediment dynamics, sequence or event stratigraphy, biogeochemistry, and sedimentary diagenesis. Each contribution rests upon a firm taxonomic foundation, although papers dealing solely with systematics and nomenclature may have less priority than those dealing with conceptual and interpretive aspects of ichnology. Contributions from biologists and geologists are equally welcome. The format for Ichnos is designed to accommodate several types of manuscripts, including Research Articles (comprehensive articles dealing with original, fundamental research in ichnology), and Short Communications (short, succinct papers treating certain aspects of the history of ichnology, book reviews, news and notes, or invited comments dealing with current or contentious issues). The large page size and two-column format lend flexibility to the design of tables and illustrations. Thorough but timely reviews and rapid publication of manuscripts are integral parts of the process.