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| Mohanti, M.. |
| Three members are informally distinguished in this formation (A, B, and C from base to top). They are present at the western part of the outcrop (thickness ca. 246 m). On the eastern and southeastern part, only member A and basal part of member B are present and the thickness is reduced to ca. 20 m. A sharp surface of discontinuity separates member A from member B. The Portilla Formation abounds in reef-building elements associated with other groups. Five major carbonate facies types are established that belong to a complex biostromal ‘reef’ facies. Vertical and lateral facies changes are demonstrated. The carbonate facies was deposited in a shallow-marine environment. Towards end of deposition of member A, sharp changes in depositional conditions... |
| Tipo: Article / Letter to the editor |
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| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/505834 |
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| Struve, W.; Mohanti, M.. |
| This paper records for the first time a rich atrypid brachiopod fauna from the Middle Devonian of the Cantabrian Mountains, Spain. A comparison of the Spanish atrypid fauna with that of Germany reveals a close similarity between the two. Even though the species are not identical, yet a comparison and stratigraphic evaluation has been made on the basis of external shape of the shells, ornamentation, etc. It is believed that the development of the Spanish species has been endemic or that the Spanish Middle Devonian sea was supplied with species immigrating from some place other than central Europe. On the basis of the distinct recession of Atrypa and the first appearance of the coarse ribbed species of Spinatrypa (Spinatrypa) a tentative Eifelian/Givetian... |
| Tipo: Article / Letter to the editor |
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| Ano: 1970 |
URL: http://www.repository.naturalis.nl/record/505655 |
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