Enigmatic wood and first evidence of tetrapods in the Yaguarí Formation (Middle-Late Permian), Uruguay
This article describes an intriguing fossil material recently found in the fine-grained sandstone levels from the upper section of the Yaguarí Formation of Uruguay. The nature of this specimen and its relationships were, initially, not easy to determine with confidence although it was subjected to s...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Universidad de la República, Facultad de Agronomía
2022-05-01
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| Series: | Agrociencia Uruguay |
| Subjects: | |
| Online Access: | http://agrocienciauruguay.uy/ojs/index.php/agrociencia/article/view/504/1154 |
| _version_ | 1797758268277260288 |
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| author | Graciela Helena Piñeiro Lorenzo Marchetti Sebastián Marmol Antonella Celio Pedro Luis Xavier Martin Francia Cesar Leandro Schultz |
| author_facet | Graciela Helena Piñeiro Lorenzo Marchetti Sebastián Marmol Antonella Celio Pedro Luis Xavier Martin Francia Cesar Leandro Schultz |
| author_sort | Graciela Helena Piñeiro |
| collection | DOAJ |
| description | This article describes an intriguing fossil material recently found in the fine-grained sandstone levels from the upper section of the Yaguarí Formation of Uruguay. The nature of this specimen and its relationships were, initially, not easy to determine with confidence although it was subjected to several analyses, such as morphological and comparative examination complemented with preparation of thin sections and microanatomical and chemical studies under SEM. However, the anatomical structure shown in the performed transversal thin sections allowed solving the issue on the different animal or plant interpretations of the fossil specimen, which was finally discerned in favor of the latter. Therefore, after a detailed comparative study of the thin sections, we concluded that the specimen is a wood fragment related to the Dadoxylon-Araucarioxylon complex. Moreover, in order to provide a better biostratigraphic calibration for these deposits until now devoid of fossils, we include a preliminary description of recently found fossil footprints, which represent the first evidence of the presence of tetrapods in levels of the Yaguarí Formation (sensu Elizalde et al., 1970), below the conglomerates that have yielded the Colonia Orozco Fauna. The footprints were preliminary assigned to the ichnotaxa cf. Karoopes isp, cf. Capitosauroides isp., and cf. Pachypes isp., suggesting the presence of gorgonopsids and therocephalian therapsids and pareiasauromorphs, respectively. The Middle-Late Permian age recently suggested for the Yaguarí Formation based on paleomagnetic and radioisotopic studies is here supported by the described fossils, which thus constitute preliminary but nonetheless relevant discoveries for deposits whose fossiliferous potential has yet to be explored. |
| first_indexed | 2024-03-12T18:27:35Z |
| format | Article |
| id | doaj.art-f4d7459102624cd591ef7e86bd0ed1cf |
| institution | Directory Open Access Journal |
| issn | 2730-5066 |
| language | English |
| last_indexed | 2024-03-12T18:27:35Z |
| publishDate | 2022-05-01 |
| publisher | Universidad de la República, Facultad de Agronomía |
| record_format | Article |
| series | Agrociencia Uruguay |
| spelling | doaj.art-f4d7459102624cd591ef7e86bd0ed1cf2023-08-02T08:31:48ZengUniversidad de la República, Facultad de AgronomíaAgrociencia Uruguay2730-50662022-05-0126NE1e50410.31285/AGRO.26.504Enigmatic wood and first evidence of tetrapods in the Yaguarí Formation (Middle-Late Permian), UruguayGraciela Helena Piñeiro0https://orcid.org/0000-0002-5872-9721Lorenzo Marchetti1https://orcid.org/0000-0002-1047-7887Sebastián Marmol2https://orcid.org/0000-0001-7059-2724Antonella Celio3https://orcid.org/0000-0002-1425-0217Pedro Luis Xavier4https://orcid.org/0000-0001-9090-5361Martin Francia5https://orcid.org/0000-0001-6107-2815Cesar Leandro Schultz6https://orcid.org/0000-0001-7121-0409Universidad de la República, Facultad de Ciencias, Departamento de Paleontología, Montevideo, UruguayMuseum für Naturkunde Berlin, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Berlin, GermanyUniversidad de la República, Facultad de Agronomía, Departamento de suelos y aguas, Montevideo, UruguayUniversidad de la República, Facultad de Agronomía, Departamento de suelos y aguas, Montevideo, UruguayUniversidade Federal do Rio Grande do Sul, Programa de Pós-Graduação em Geociências, Porto Alegre, BrasilUniversidad de la República, Facultad de Agronomía, Departamento de suelos y aguas, Montevideo, UruguayUniversidade Federal do Rio Grande do Sul, Departamento de Estratigrafia e Paleontologia, Porto Alegre, BrasilThis article describes an intriguing fossil material recently found in the fine-grained sandstone levels from the upper section of the Yaguarí Formation of Uruguay. The nature of this specimen and its relationships were, initially, not easy to determine with confidence although it was subjected to several analyses, such as morphological and comparative examination complemented with preparation of thin sections and microanatomical and chemical studies under SEM. However, the anatomical structure shown in the performed transversal thin sections allowed solving the issue on the different animal or plant interpretations of the fossil specimen, which was finally discerned in favor of the latter. Therefore, after a detailed comparative study of the thin sections, we concluded that the specimen is a wood fragment related to the Dadoxylon-Araucarioxylon complex. Moreover, in order to provide a better biostratigraphic calibration for these deposits until now devoid of fossils, we include a preliminary description of recently found fossil footprints, which represent the first evidence of the presence of tetrapods in levels of the Yaguarí Formation (sensu Elizalde et al., 1970), below the conglomerates that have yielded the Colonia Orozco Fauna. The footprints were preliminary assigned to the ichnotaxa cf. Karoopes isp, cf. Capitosauroides isp., and cf. Pachypes isp., suggesting the presence of gorgonopsids and therocephalian therapsids and pareiasauromorphs, respectively. The Middle-Late Permian age recently suggested for the Yaguarí Formation based on paleomagnetic and radioisotopic studies is here supported by the described fossils, which thus constitute preliminary but nonetheless relevant discoveries for deposits whose fossiliferous potential has yet to be explored.http://agrocienciauruguay.uy/ojs/index.php/agrociencia/article/view/504/1154dadoxylon-like woodkaroopescapitosauroides and pachypes-like trackspaleoenvironmentsyaguarí formation stratigraphyguadalupian-lopingian boundaryuruguay |
| spellingShingle | Graciela Helena Piñeiro Lorenzo Marchetti Sebastián Marmol Antonella Celio Pedro Luis Xavier Martin Francia Cesar Leandro Schultz Enigmatic wood and first evidence of tetrapods in the Yaguarí Formation (Middle-Late Permian), Uruguay Agrociencia Uruguay dadoxylon-like wood karoopes capitosauroides and pachypes-like tracks paleoenvironments yaguarí formation stratigraphy guadalupian-lopingian boundary uruguay |
| title | Enigmatic wood and first evidence of tetrapods in the Yaguarí Formation (Middle-Late Permian), Uruguay |
| title_full | Enigmatic wood and first evidence of tetrapods in the Yaguarí Formation (Middle-Late Permian), Uruguay |
| title_fullStr | Enigmatic wood and first evidence of tetrapods in the Yaguarí Formation (Middle-Late Permian), Uruguay |
| title_full_unstemmed | Enigmatic wood and first evidence of tetrapods in the Yaguarí Formation (Middle-Late Permian), Uruguay |
| title_short | Enigmatic wood and first evidence of tetrapods in the Yaguarí Formation (Middle-Late Permian), Uruguay |
| title_sort | enigmatic wood and first evidence of tetrapods in the yaguari formation middle late permian uruguay |
| topic | dadoxylon-like wood karoopes capitosauroides and pachypes-like tracks paleoenvironments yaguarí formation stratigraphy guadalupian-lopingian boundary uruguay |
| url | http://agrocienciauruguay.uy/ojs/index.php/agrociencia/article/view/504/1154 |
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