Coniacian sandstones from the North Sudetic Synclinorium revisited: palaeoenvironmental and palaeogeographical reconstructions based on trace fossil analysis and associated body fossils

Author:

Chrząstek Alina1,Wypych Monika2

Affiliation:

1. Institute of Geological Sciences , Wrocław University , Plac M. Borna 9, 50-204 Wrocław , Poland

2. Wrocław University , Plac Uniwersytecki 1, 50-137 Wrocław , Poland

Abstract

Abstract The Coniacian quartz sandstones (Żerkowice Member, Rakowice Wielkie Formation) that crop out at quarries near Czaple-Nowa Wieś Grodziska (North Sudetic Synclinorium) contain a low-diversity assemblage of trace fossils: Gyrochorte isp., Ophiomorpha nodosaLundgren, 1891, Ophiomorpha isp., Phycodes cf. curvipalmatum (Pollard, 1981), ?Phycodes isp., Planolites cf. beverleyensis (Billings, 1862), Thalassinoides paradoxicusWoodward, 1830 and ?Thalassinoides isp. Moreover, interesting compound burrow systems, here referred to as Thalassinoides-Phycodes cf. palmatus and ?Thalassinoides-Phycodes, were recognised at the Czaple Quarry. Additionally, ?Gyrochorte isp., Phycodes cf. flabellum (Miller and Dyer, 1878) and ?Treptichnus isp. were encountered at correlative levels in the Rakowice Małe Quarry. Some of these ichnotaxa have not been recorded previously from Coniacian sandstones of the Żerkowice Member. Additionally, in slabs of these sandstones, the gastropod Nerinea bicinctaBronn, 1836 and the bivalve Lima haidingeriZittel, 1866 were found. These interesting finds, in particular the gastropods, were already noted from the study area in the first half of the twentieth century by Scupin (1912–1913). Ethologically, the trace fossil assemblage is represented by domichnia or domichnia/fodinichnia (Ophiomorpha, Thalassinoides), fodinichnia (Phycodes) and pascichnia (Gyrochorte, Planolites). The compound burrow systems (Thalassinoides-Phycodes) are interpreted as dwelling/feeding structures. The possible tracemakers are crustaceans (Ophiomorpha, Thalassinoides) or worm-like animals (annelids and other) (Planolites, ?Phycodes, Gyrochorte and ?Treptichnus). The assemblage of trace fossils is characteristic of the Skolithos ichnofacies and Cruziana ichnofacies, typical of shallow-marine settings. Ichnological studies, as well as the presence of accompanying fossils (bivalves, gastropods), confirm the palaeoenvironmental reconstruction of the Żerkowice Member sandstones by Leszczyński (2010). That author interpreted the Coniacian sandstones as bar and storm deposits laid down in a shallow epicontinental sea (mainly the foreshore-upper shoreface; up to the middle shoreface) under normal oxygenation and salinity, in soft substrate, above fair-weather wave base. The deposition of the Żerkowice Member sandstones is linked to a regression that started after uplift of the southeastern part of the North Sudetic Synclinorium.

Publisher

Walter de Gruyter GmbH

Subject

General Earth and Planetary Sciences

Reference205 articles.

1. Abbassi, N., 2007. Shallow marine trace fossils from Upper Devonian sediments of the Kuh-e Zard, Zefreh area, Central Iran. Iranian Journal of Science & Technology, Transaction A 31, No A1, 23–33.

2. Abbassi, N., Shirazi, M.P & Hosseinzadeh, M.A., 2015. Thalassinoides-Phycodes compound trace fossils from Albian-Cenomanian sediments of Gazk, South Kerman, SE Iran. Geosciences, Stratigraphy & Sedimentology 24, 145–152.

3. Aceñolaza, F.G., Carlorosi, J. & Heredia, S., 2010. Trazas Fósiles Y Conodontes En El Ordovícico Del Flanco Occidental De La Cuesta De Lipán, Departamento Purmamarca, Jujuy. Revista de la Asociacion Geológica Argentina 66, 164–170.

4. Alexandrowicz, S.W., 1976. Foraminifera from the brackish Santonian deposits in the North Sudetic Basin (Western Poland). Rocznik PTG, Annales de la Société Géologique de Pologne 46, 183–195.

5. Alexandrowicz, S. & Kwiecińska, B., 1977. Amber from the Upper Cretaceous deposits of SW Poland. Mineralogia Polonica 8, 39–47.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3