Abstract
We here present the first systematic description of Devonian plant fossils from Chile. The material was collected from the Upper Devonian El Toco Formation in the Coastal Cordillera of northern Chile. Plant fossils occur as impressions of lycopsid axes in marine turbiditic greywacke beds and comprise Haplostigma furquei (Frenguelli) Gutiérrez, Malanzania cf. nana Archangelsky, Azcuy and Wagner, and further unidentifiable remains. The biostratigraphic ranges of these taxa agree well with previous age assessments for this sequence, based on conodonts and radiometric data. Haplostigma was widely distributed in the middle-to-high latitude, cool-temperate biome of southern Gondwana, providing further evidence that Middle to Late Devonian extra-tropical floras of Gondwana were dominated by low-diversity associations of herbaceous lycopsids.
Kurzfassung
Erstmals werden hier Pflanzenfossilien aus dem Paläozoikum Chiles beschrieben. Es handelt sich um Abdruckreste verschiedenartiger krautförmiger Lycopsiden, die in den marinen Turbiditablagerungen der oberdevonischen El Toco Formation in der nordchilenischen Küstenkordillere gesammelt wurden. Die Lycopsidenachsen werden zu Haplostigma furquei (Frenguelli) Gutiérrez und Malanzania cf. nana Archangelsky, Azcuy and Wagner gestellt. Es treten allerdings noch weitere, bisher unbestimmte Lycopsidenreste auf. Die Funde bestätigen bisherige Altersannahmen für die El Toco Formation, die sich auf Conodontenproben aus überlagernden Schichten sowie auf radiometrische Datierungen granitischer Intrusiva stützen. Ein Vergleich mit gleichaltrigen Pflanzenvergesellschaftungen aus Gondwana verdeutlicht, dass die Vegetation in höheren Breitengraden der Südhemisphere während des Devons vorwiegend von gering-diversen Assoziationen krautförmiger Lycopsiden dominiert war.
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Acknowledgments
We thank the Dirección de Investigación y Postgrado of the Universidad Católica del Norte (Chile) who supported the fieldwork. We thank Cristián Vergara (Antofagasta, Chile) for his assistance during fieldwork. The first author acknowledges the help of Sergio Archangelsky, Heinrich Bahlburg (Münster, Germany), Pedro Gutiérrez (Buenos Aires, Argentina), Stephen McLoughlin (Stockholm, Sweden) and Eduardo Morel (La Plata, Argentina), who kindly provided literature and valuable information. Benjamin Bomfleur (Münster, Germany) and Christian Pott (Stockholm, Sweden) are thanked for their constructive comments on an early draft of this manuscript. Thanks are extended to Leonel Jofré (Antofagasta, Chile) for drawing an early version of Fig. 1.
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Moisan, P., Niemeyer, H. & Kerp, H. Lycopsids from the Upper Devonian of northern Chile with remarks on the geographical distribution of the morphogenus Haplostigma Seward. Paläontol Z 85, 231–240 (2011). https://doi.org/10.1007/s12542-010-0093-6
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DOI: https://doi.org/10.1007/s12542-010-0093-6