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| Boschma, D.; Staalduinen, C.J. van. |
| Distinct general lithological features, separated by unconformities, serve to distinguish three groups of mappable formations in the Carboniferous of the area, the Ruesga Group, the Yuso Group and the Cea Group. The formations which compose the Ruesga Group can be found in the greater part of the area. In general they start with a limestone series developing upwards and laterally into greywackes. The conglomerates and molasse greywackes formations of the Yuso Group follow and are limited by two major structural zones; in the west the zone that runs over the Pardomino Ridge and the Pontón fault line and in the south the León line. West of the “Pardomino-Pontón” zone other formations have been mapped, but the information is still insufficient for a good... |
| Tipo: Article / Letter to the editor |
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| Ano: 1969 |
URL: http://www.repository.naturalis.nl/record/505621 |
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| Staalduinen, C.J. van. |
| Precambrian clastic rocks, deposited under unstable conditions, were folded before in a relatively stable environment shallow marine sedimentation spread out over the whole area. Silico-clastic sediments were deposited from Cambrian to Devonian, except from the Lower-Middle Cambrian when carbonate deposition dominated. With a hiatus in sedimentation during the Llanvirn to Llandovery the influence of a rising block, NNE of the present area, started. During the Silurian this rise resulted in development of clastic sequences trending to thin towards the N. From the Devonian to Upper Carboniferous sedimentation circumstances became less stable. As a result an alternation of clastic and carbonate rocks developed. Towards the end of the Devonian epeirogenetic... |
| Tipo: Article / Letter to the editor |
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| Ano: 1973 |
URL: http://www.repository.naturalis.nl/record/505843 |
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