Bartonian reticulate Nummulites of Kutch

IF 1.5 Q1 Earth and Planetary Sciences

Geodinamica Acta Pub Date : 2017-03-16 DOI:10.1080/09853111.2017.1300847

P. Saraswati, Danish Anwar, A. Lahiri

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引用次数: 3

Abstract

Nummulites with reticulate septal filaments stratigraphically span from the Bartonian to the Rupelian Stages. The size of the proloculus of the megalospheric forms of reticulate species helped recognise N. fabianii – N. fichteli lineage in western Tethys. Unlike the species of this lineage, N. ptukhiani, described from Armenia, is characterised by an unusually large proloculus. A possibly second lineage of reticulate species comprising N. ptukhiani is recently reported from Lutetian – Bartonian succession of Tanzania. The present study examines reticulate species from palaeogeographically adjacent Bartonian succession of Kutch. The statistical analysis of the biometric data suggests the presence of three distinct species, referred to Nummulites ptukhiani, N. aff. hormoensis and N. acutus. The reticulation starts developing in N. acutus that ranges from P13 to P14 in its type locality, Kutch. We infer that Nummulites ptukhiani and N. aff. hormoensis possibly evolved from N. acutus in Zone P14. A binary tree model based on Classification and Regression Tree is proposed to statistically discriminate the three reticulate species.

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库奇Bartonian网状Nummulites

具有网状隔丝的多聚体在地层上从巴顿期跨越到鲁伯利期。网状物种巨球形态的前尾的大小有助于识别特提斯西部的N. fabianii - N. fichteli谱系。与这个谱系的物种不同，来自亚美尼亚的N. ptukhiani的特征是一个异常大的前栉。最近在坦桑尼亚的Lutetian - Bartonian演替中报道了一种可能由ntukhiani组成的网状物种的第二世系。本研究考察了古地理上毗邻库奇巴尔顿演替的网状物种。生物特征数据的统计分析表明存在三个不同的物种，分别是Nummulites ptukhiani, N. affs . hormoensis和N. acutus。在库奇，在其类型地区，从P13到P14范围内的尖尖乌鳢开始形成网状结构。推测P14带的麻麻猴和麻麻猴可能是由针尖猴进化而来。提出了一种基于分类回归树的二叉树模型，对三种网纹物种进行统计区分。

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来源期刊

Geodinamica Acta 地学-地球科学综合

CiteScore

4.50

自引率

0.00%

发文量

审稿时长

25 weeks

期刊介绍： Geodinamica Acta provides an international and interdisciplinary forum for the publication of results of recent research dealing with both internal and external geodynamics. Its aims to promote discussion between the various disciplines that work on the dynamics of the lithosphere and hydrosphere. There are no constraints over themes, provided the main thrust of the paper relates to Earth''s internal and external geodynamics. The Journal encourages the submission of papers in all fields of earth sciences, such as biostratigraphy, geochemistry, geochronology and thermochronology, geohazards and their societal impacts, geomorphology, geophysics, glaciology, igneous and metamorphic petrology, magmatism, marine geology, metamorphism, mineral-deposits and energy resources, mineralogy, orogeny, palaeoclimatology, palaeoecology, paleoceanograpgy, palaeontology, petroleum geology, sedimentology, seismology and earthquakes, stratigraphy, structural geology, surface processes, tectonics (neoteoctonic, plate tectonics, seismo-tectonics, Active tectonics) and volcanism. Geodinamica Acta publishes high quality, peer-reviewed original and timely scientific papers, comprehensive review articles on hot topics of current interest, rapid communications relating to a significant advance in the earth sciences with broad interest, and discussions of papers that have already appeared in recent issues of the journal. Book reviews are also included. Submitted papers must have international appeal and regional implications; they should present work that would be of interest to many different specialists. Geographic coverage is global and work on any part of the world is considered. The Journal also publishes thematic sets of papers on topical aspects of earth sciences or special issues of selected papers from conferences.