Some charophytes from the middle dinosaur member of the Tendaguru formation (Upper Jurassic of Tanzania)
Biostratigraphy and paleoecology of the famous dinosaur beds of Tendaguru Formation, Tanzania, East Africa are still under discussion. Calcareous microfossils have not yet contributed to this question. Four samples from the Middle Dinosaur Member have now yielded charophyte gyrogonites of the specie...
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| Format: | Article |
| Language: | English |
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Pensoft Publishers
1999-01-01
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| Series: | Fossil Record |
| Online Access: | https://fr.pensoft.net/article/30200/download/pdf/ |
| _version_ | 1797370126633271296 |
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| author | M. E. Schudack |
| author_facet | M. E. Schudack |
| author_sort | M. E. Schudack |
| collection | DOAJ |
| description | Biostratigraphy and paleoecology of the famous dinosaur beds of Tendaguru Formation, Tanzania, East Africa are still under discussion. Calcareous microfossils have not yet contributed to this question. Four samples from the Middle Dinosaur Member have now yielded charophyte gyrogonites of the species Aclistochara cf. bransonii, Aclistochara cf. minor, Mesochara canellata, and Mesochara harrisi. Considering ammonite datations in under- and overlying members, even their long stratigrapical ranges point to a Kimmeridgian age for the Middle Dinosaur Member of Tendaguru Formation. Salinity tolerances of the species (if autochthonous) suggest a variable environment with partly brackish, partly freshwater influences.Biostratigraphie und Paläoökologie der berühmten Dinosaurier-Fundschichten am Tendaguru Hill in Tansania (Ostafrika) sind bis heute umstritten. Kalkige Mikrofossilien hatten zu dieser Diskussion bisher nicht beigetragen. In vier Proben aus dem Mittleren Dinosauriermergel fanden sich nun Charophyten-Gyrogonite der Arten Aclistochara cf. bransonii, Aclistochara cf. minor, Mesochara canellata und Mesochara harrisi. Trotz generell langer stratigraphischer Reichweiten dieser Arten macht ihr Vorkommen im Zusammenhang mit Ammonitenfunden in unter- und überlagernden Schichten ein Kimmeridgium-Alter des Mittleren Dinosauriermergels wahrscheinlich, während ihre Salinitätstoleranzen (autochthones Vorkommen vorausgesetzt) auf ein wechselhaftes Milieu mit teils schwach brackischen, teils Süßwassereinflüssen hindeuten.doi:10.1002/mmng.1999.4860020115 |
| first_indexed | 2024-03-08T17:56:57Z |
| format | Article |
| id | doaj.art-14c47063884947ecb8a797fe64759ba5 |
| institution | Directory Open Access Journal |
| issn | 2193-0074 |
| language | English |
| last_indexed | 2024-03-08T17:56:57Z |
| publishDate | 1999-01-01 |
| publisher | Pensoft Publishers |
| record_format | Article |
| series | Fossil Record |
| spelling | doaj.art-14c47063884947ecb8a797fe64759ba52024-01-02T04:12:39ZengPensoft PublishersFossil Record2193-00741999-01-012120120510.1002/mmng.1999.486002011530200Some charophytes from the middle dinosaur member of the Tendaguru formation (Upper Jurassic of Tanzania)M. E. Schudack0Institut für Paläontologie der FU Berlin, Malteserstraße 74–100Biostratigraphy and paleoecology of the famous dinosaur beds of Tendaguru Formation, Tanzania, East Africa are still under discussion. Calcareous microfossils have not yet contributed to this question. Four samples from the Middle Dinosaur Member have now yielded charophyte gyrogonites of the species Aclistochara cf. bransonii, Aclistochara cf. minor, Mesochara canellata, and Mesochara harrisi. Considering ammonite datations in under- and overlying members, even their long stratigrapical ranges point to a Kimmeridgian age for the Middle Dinosaur Member of Tendaguru Formation. Salinity tolerances of the species (if autochthonous) suggest a variable environment with partly brackish, partly freshwater influences.Biostratigraphie und Paläoökologie der berühmten Dinosaurier-Fundschichten am Tendaguru Hill in Tansania (Ostafrika) sind bis heute umstritten. Kalkige Mikrofossilien hatten zu dieser Diskussion bisher nicht beigetragen. In vier Proben aus dem Mittleren Dinosauriermergel fanden sich nun Charophyten-Gyrogonite der Arten Aclistochara cf. bransonii, Aclistochara cf. minor, Mesochara canellata und Mesochara harrisi. Trotz generell langer stratigraphischer Reichweiten dieser Arten macht ihr Vorkommen im Zusammenhang mit Ammonitenfunden in unter- und überlagernden Schichten ein Kimmeridgium-Alter des Mittleren Dinosauriermergels wahrscheinlich, während ihre Salinitätstoleranzen (autochthones Vorkommen vorausgesetzt) auf ein wechselhaftes Milieu mit teils schwach brackischen, teils Süßwassereinflüssen hindeuten.doi:10.1002/mmng.1999.4860020115https://fr.pensoft.net/article/30200/download/pdf/ |
| spellingShingle | M. E. Schudack Some charophytes from the middle dinosaur member of the Tendaguru formation (Upper Jurassic of Tanzania) Fossil Record |
| title | Some charophytes from the middle dinosaur member of the Tendaguru formation (Upper Jurassic of Tanzania) |
| title_full | Some charophytes from the middle dinosaur member of the Tendaguru formation (Upper Jurassic of Tanzania) |
| title_fullStr | Some charophytes from the middle dinosaur member of the Tendaguru formation (Upper Jurassic of Tanzania) |
| title_full_unstemmed | Some charophytes from the middle dinosaur member of the Tendaguru formation (Upper Jurassic of Tanzania) |
| title_short | Some charophytes from the middle dinosaur member of the Tendaguru formation (Upper Jurassic of Tanzania) |
| title_sort | some charophytes from the middle dinosaur member of the tendaguru formation upper jurassic of tanzania |
| url | https://fr.pensoft.net/article/30200/download/pdf/ |
| work_keys_str_mv | AT meschudack somecharophytesfromthemiddledinosaurmemberofthetendaguruformationupperjurassicoftanzania |