Academic Journal
Taphonomy of a Panopea Ménard de la Groye, 1807 shell bed from the pisco formation (Miocene, Peru)
| العنوان: | Taphonomy of a Panopea Ménard de la Groye, 1807 shell bed from the pisco formation (Miocene, Peru) |
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| المؤلفون: | Bosio G., Bracchi V. A., Malinverno E., Collareta A., Coletti G., Gioncada A., Koci T., Di Celma C., Bianucci G., Basso D. |
| المساهمون: | Bosio, G., Bracchi, V. A., Malinverno, E., Collareta, A., Coletti, G., Gioncada, A., Koci, T., Di Celma, C., Bianucci, G., Basso, D. |
| سنة النشر: | 2021 |
| المجموعة: | ARPI - Archivio della Ricerca dell'Università di Pisa |
| مصطلحات موضوعية: | Biostratinomy, Diagenesi, Dolomite, East Pisco Basin, Encruster, Fossil geoduck |
| الوصف: | Invertebrate taphonomy can provide significant information about the post-mortem processes that affected the fossil record. In the East Pisco Basin of southern Peru, a Panopea Ménard de la Groye, 1807 shell bed was found in the upper Miocene strata of the Pisco Formation, hinting at a peculiar biostratinomic and diagenetic history. This bed contains abundant invertebrate fossil molds cemented by dolomite. The specimens of the deep infaunal bivalve, Panopea sp., occur together with bivalves representative of shallow infaunal species (Trachycardium sp. and Dosinia ponderosa [Gray, 1838]) and balanid barnacles, which are sessile encrusters. The Panopea specimens host compound molds evidencing an abundant encrusting fauna, including serpulids, ?foraminifera, bryozoans, and barnacles that colonized the inner surfaces of the valves before their final burial. We hypothesize that short-term, storm-related processes exhumed the living bivalves, resulting in a sedimentological concentration of relatively well-preserved shells. After the death of the exhumed bivalves, the inner surfaces of the articulated Panopea shells, representing hard-substratal, sheltered environments on an otherwise unstable sandy seafloor (i.e., “benthic islands”), were colonized by different encrusting organisms. Following the final burial, dolomite precipitated, cementing the sediment infill of the valves. Lastly, a decrease of pH occurred at the sulfate reduction-methanogenesis boundary, inducing the dissolution of the shell carbonate. ; La taphonomie des invertébrés peut fournir des informations importantes sur les processus post mortem qui ont affecté les registres fossiles. Dans la partie orientale du Bassin Pisco, dans le sud du Pérou, une couche riche en Panopea Ménard de la Groye, 1807 qui témoigne d’une histoire taphonomique et diagénétique particulière a été trouvée dans les strates du Miocène supérieur de la Formation de Pisco. Cette couche est riche en moules d’invertébrés cimentés par la dolomite. Les spécimens de ... |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | ELETTRONICO |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:000624593300001; volume:20; issue:8; firstpage:119; lastpage:140; numberofpages:22; journal:COMPTES RENDUS PALEVOL; https://hdl.handle.net/11568/1117006; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85101359138 |
| DOI: | 10.5852/cr-palevol2021v20a8 |
| الاتاحة: | https://hdl.handle.net/11568/1117006 https://doi.org/10.5852/cr-palevol2021v20a8 |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.BDDE5111 |
| قاعدة البيانات: | BASE |
| DOI: | 10.5852/cr-palevol2021v20a8 |
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