Carbonaceous macrofossils from the Ediacaran–Cambrian lower shale member of the Soltanieh formation, Northwestern Iran

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-02-08 DOI:10.1016/j.precamres.2025.107722

Najmeh Etemad-Saeed , Shuhai Xiao , Steve C. Wang , Kristin D. Bergmann , Andrew H. Knoll

{"title":"Carbonaceous macrofossils from the Ediacaran–Cambrian lower shale member of the Soltanieh formation, Northwestern Iran","authors":"Najmeh Etemad-Saeed , Shuhai Xiao , Steve C. Wang , Kristin D. Bergmann , Andrew H. Knoll","doi":"10.1016/j.precamres.2025.107722","DOIUrl":null,"url":null,"abstract":"<div><div>The Ediacaran–lower Cambrian Soltanieh Formation exposed in the Soltanieh Mountains of northwestern Iran is a mixed siliciclastic-carbonate succession that hosts skeletal animals, metazoan trace fossils, and macroalgal compressions, in addition to a well-resolved C isotopic record. Here we attempt to clarify the systematic paleontology of carbonaceous compression macrofossils found at the base of the Lower Shale Member of this formation, close to the Ediacaran–Cambrian boundary, and discuss their implications for our understanding of the early evolution of complex multicellular organisms. We identified five distinct morphological groups: (1) small discoidal fossils (chuarids), (2) branching thalli (<em>Eoholynia corumbensis</em>), (3) large discoidal fossils (<em>Doulia rara</em>), (4) simple ribbon-like compressions, and (5) chuarid-like discoidal structures with an attached filament. These fossils display limited diversity but include representatives of the three groups that dominate Ediacaran–Cambrian macrophyte diversity globally. All are present at the stratigraphic level in which Cambrian animals and trace fossils first appear, providing broader biological context for understanding early animal diversification.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"419 ","pages":"Article 107722"},"PeriodicalIF":3.2000,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Precambrian Research","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301926825000488","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

The Ediacaran–lower Cambrian Soltanieh Formation exposed in the Soltanieh Mountains of northwestern Iran is a mixed siliciclastic-carbonate succession that hosts skeletal animals, metazoan trace fossils, and macroalgal compressions, in addition to a well-resolved C isotopic record. Here we attempt to clarify the systematic paleontology of carbonaceous compression macrofossils found at the base of the Lower Shale Member of this formation, close to the Ediacaran–Cambrian boundary, and discuss their implications for our understanding of the early evolution of complex multicellular organisms. We identified five distinct morphological groups: (1) small discoidal fossils (chuarids), (2) branching thalli (Eoholynia corumbensis), (3) large discoidal fossils (Doulia rara), (4) simple ribbon-like compressions, and (5) chuarid-like discoidal structures with an attached filament. These fossils display limited diversity but include representatives of the three groups that dominate Ediacaran–Cambrian macrophyte diversity globally. All are present at the stratigraphic level in which Cambrian animals and trace fossils first appear, providing broader biological context for understanding early animal diversification.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.