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| Cosijn, A.J.. |
| During my stay in Spain a rock was found in the surroundings of Ronda, wherein Cycloclypeus was met with by the side of other foraminifera. The scarcity of our knowledge about the occurrence of this genus in Europe and in the Mediterranean Basin, induced me to collect in different parts of Spain, more material wherein Cycloclypeus might occur, especially Oligocene and Miocene rocks. The inducement became even stronger, when a publication by Tan Sin Hok about the genus Cycloclypeus Carpenter, demonstrated the value this genus has for stratigraphy. The results obtained during the examination of the samples, induced me to deviate from my original intention, of giving a survey of the development of the foraminifera-containing Oligocene in some parts of Spain... |
| Tipo: Article / Letter to the editor |
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| Ano: 1938 |
URL: http://www.repository.naturalis.nl/record/505963 |
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| Cosijn, A.J.. |
| In the following pages data will be given about the size of the megalospheric embryonic apparatus, and of the size of the shell, of some Foraminifera. By comparing these data for a certain species from different samples, the relative ages of which are known, it will be possible, to get an insight into the alterations of the measured characters in geological times. For that purpose samples from geological sections, or otherwise well defined geological formations, were used. A description of each of these sections will be given, in order to discuss the reliability of the determinations of the relative ages of the samples. I may point out here, that as the layers containing the foraminiferal shells have a certain thickness, and as the sampling has been done... |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/505835 |
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