Small shelly fauna biodiversity from reef-adjacent facies of the lower Cambrian Harkless Formation, Nevada

IF 2.6 2区地球科学 Q2 GEOGRAPHY, PHYSICAL

Palaeogeography, Palaeoclimatology, Palaeoecology Pub Date : 2025-04-03 DOI:10.1016/j.palaeo.2025.112922

Casey C. Bennett, Clare Mate, Sarah M. Jacquet

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引用次数: 0

Abstract

Cambrian archaeocyathid reef systems represent the earliest metazoan-dominated topographically complex bioconstructions in the rock record and provide valuable insights into community composition with respect to the major framework builders and their small shelly fossil (SSF) inhabitants. This study quantified variations in the composition of SSF assemblages (richness, evenness, and diversity) in relation to proximity to biohermal facies of the lower Cambrian (Series 2, Stage 4) Harkless Formation in southern Esmeralda County, Nevada. Combining petrographic and quantitative analyses with a systematic review of the SSFs reveals a low diversity, but abundant assemblage. Trends in species richness, evenness and diversity show no consistent patterns in distance from the reef across the measured sections. However, lithology serves as a major control in determining SSF biofacies, with select fauna exhibiting evidence of taphonomic controls. More research is needed to investigate spatial relationships of shelly faunas across these ancient carbonate archaeocyathid reefs and platforms to determine the role early reef habitats have on local biodiversity.

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内华达州下寒武统Harkless组礁邻相小贝壳动物群的生物多样性

寒武纪古ocyathid珊瑚礁系统代表了岩石记录中最早的以后生动物为主的地形复杂生物结构，并提供了有关主要框架构建者及其小壳壳化石（SSF）居民的群落组成的宝贵见解。本研究量化了SSF组合组成的变化（丰富度、均匀度和多样性）与内华达州南部Esmeralda县下寒武统（系列2，阶段4）Harkless组生物热相的接近程度。结合岩石学和定量分析以及对SSFs的系统回顾，发现其多样性低，但组合丰富。物种丰富度、均匀度和多样性的趋势在与珊瑚礁的距离上没有一致的模式。然而，岩性是确定SSF生物相的主要控制因素，选择的动物群显示出地层学控制的证据。为了确定早期珊瑚礁栖息地对当地生物多样性的影响，还需要进一步研究这些古碳酸盐太古藻礁和平台上壳类动物群的空间关系。

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来源期刊

Palaeogeography, Palaeoclimatology, Palaeoecology 地学-地球科学综合

CiteScore

5.90

自引率

10.00%

发文量

398

审稿时长

3.8 months

期刊介绍： Palaeogeography, Palaeoclimatology, Palaeoecology is an international medium for the publication of high quality and multidisciplinary, original studies and comprehensive reviews in the field of palaeo-environmental geology. The journal aims at bringing together data with global implications from research in the many different disciplines involved in palaeo-environmental investigations. By cutting across the boundaries of established sciences, it provides an interdisciplinary forum where issues of general interest can be discussed.