VRTBY ICHNORODU GASTROCHAENOLITES JAKOŽTO ŽIVOTNÍ PROSTOR MLŽŮ Z LOKALITY BORAČ-PODOLÍ (KARPATSKÁ PŘEDHLUBEŇ, ČESKÁ REPUBLIKA)

Q4 Earth and Planetary Sciences

Geological Research in Moravia and Silesia Pub Date : 2018-12-17 DOI:10.5817/gvms2018-1-2-49

Jaroslav Šamánek, R. Mikuláš, Nela Doláková, Š. Hladilová

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Abstract

In 2015 the locality Borač-Podolí was newly examined. The locality is situated 8 km NW from the town of Tišnov. A large amount of shallow-water fossils of middle Miocene (Badenian) age was collected. The state of preservation of the material enabled us bivalve borings of ichnogenus Gastrochaenolites which were bored into colonies of hermatype corals and other calcareous hard substrates. In some of these borings, bivalves were found in situ. The borings were determined as Gastrochaenolites isp., Gastrochaenolites orbicularis, Gastrochaenolites lapidicus, Gastrochaenolites dijugus and Gastrochaenolites torpedo. The in situ bivalves were determined as Gastrochaena cf. intermedia, Rocellaria cf. dubia, Hiatella arctica and Cardita calyculata. The first three species probably represent primary borers while Cardita calyculata is probably a secondary user (squatter). Based on an analysis of fossil material, we can assume that borings were created aft er the death of corals during the repeated transport of these bioclasts. It led to colonizing of the whole surface of coral bioclasts. The bioclasts were then moved to deeper water. Transport to water with clay sedimentation enabled the preservation of the bivalves in situ in borings.

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ICHNORODE GASTROCHAENOLITES井作为博拉Č-POLÍ地区（捷克共和国KARPATSKÁPředhléń）泥浆的生活空间

2015年，Borač-Podolí地区进行了新的检查。该地区位于Tišnov镇西北8公里处。收集了大量中新世中期（巴登尼亚）的浅水化石。这种材料的保存状态使我们能够对腹足类单壳虫进行双壳类钻孔，这些单壳虫被钻入两性珊瑚和其他钙质坚硬基质的群落中。在其中一些钻孔中，在原地发现了双壳类动物。这些钻孔被确定为Gastrochaenolites isp。，轮匝天麻、垂腹天麻、双柱天麻和鱼雷天麻。原位双壳类被确定为Gastrochaena cf.intermedia、Rocellaria cf.dubia、Hiatella arctica和Cardita calyculata。前三个物种可能代表初级蛀虫，而杯状红雀可能是次级使用者（擅自占用者）。根据对化石材料的分析，我们可以假设钻孔是在珊瑚死亡后，在这些生物碎屑的重复运输过程中产生的。它导致珊瑚生物碎屑的整个表面定植。然后将生物碎屑移到更深的水中。通过粘土沉积运输到水中，使双壳类能够在钻孔中原位保存。

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来源期刊

Geological Research in Moravia and Silesia Earth and Planetary Sciences-Geology

CiteScore

0.40

自引率

0.00%

发文量

期刊介绍： The Geological research is peer-reviewed open access journal that publishes original research articles. The journal aims principally at quick publication of variety results from different fields of geological sciences and its applied sectors including interdisciplinary topics, laboratory experiments and modelling. Journal is focused on basic data and their simple and clear interpretation. Its aim is to facilitate the systematic development of the scientific body of knowledge in the field of geosciences with a span beyond the region of Central Europe. The form of articles/texts is as concise as possible. There is a section for publication of extended abstracts from conferences and meetings as well.