Morphological abnormalities observed in the species Ammobaculites texanus cushman and paleoenvironmental implications

IF 0.7 Q4 PALEONTOLOGY

REVUE DE MICROPALEONTOLOGIE Pub Date : 2020-10-01 DOI:10.1016/j.revmic.2020.100444

Orabi H. Orabi

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引用次数: 4

Abstract

The morphological abnormalities caused on the agglutinated foraminifera Ammobaculites texanus CUSHMAN extracted from the Lower Kharga Member of the Dakhla Formation (Upper Maastrichtian) deposits may be caused due to environmental factors such as high organic flux, high terrigenous input and low salinity as indicated by the presence of Ammoastuta together with A. texanus agglutinated foraminifera, which suggested hyposaline environments.

The deformations described in this work are several types of morphological abnormalities, including irregular chamber shape (lobate peripheral outline), abnormal size or shape of the last chambers, high spire giving a spiroconvex test and irregular coiling, and additional chambers (elongated axes of rotation). Some studied species of A. texanus show compaction and the collapse of the inner microgranular layer, the compaction indicates the binding of quartz grains with a deformable substance before cementation.

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土质库什曼Ammobaculites texanus cushman的形态异常及其古环境意义

从Dakhla组下Kharga段(上马strichtian)沉积物中提取的凝集有孔虫Ammobaculites texanus CUSHMAN的形态异常可能是由于高有机通量、高陆源输入和低盐度等环境因素造成的，如Ammoastuta和A. texanus凝集有孔虫的存在，表明环境低盐。在这项工作中描述的变形是几种形态异常，包括不规则的腔室形状(叶状外围轮廓)，最后腔室的大小或形状异常，高尖顶进行螺旋凸测试和不规则卷曲，以及额外的腔室(延长的旋转轴)。部分研究种的石英砂显示出压实作用和内部微颗粒层的塌陷，这种压实作用表明石英颗粒在胶结前与可变形物质结合。

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来源期刊

REVUE DE MICROPALEONTOLOGIE PALEONTOLOGY-

CiteScore

2.50

自引率

0.00%

发文量

期刊介绍： La Revue de micropaléontologie publie 4 fois par an des articles de intérêt international, consacrés à tous les aspects de la micropaléontologie. Les textes, en anglais ou en français, sont des articles originaux, des résultats de recherche, des synthèses et mises au point, des comptes rendus de réunions scientifiques et des analyses de ouvrages. La revue se veut résolument ouverte à tous les aspects de la micropaléontologie en accueillant des travaux traitant de la systématique des microfossiles (et de leurs équivalents actuels), des bactéries aux microrestes de vertébrés, et de toutes leurs applications en sciences biologiques et géologiques.