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| Registros recuperados: 10 | |
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| Donovan, S.K.. |
| A distinctive chert erratic pebble found on the beach at Overstrand, north Norfolk, eastern England, is a Derbyshire screwstone. Such cherts are typical of the Mississippian (Lower Carboniferous) limestones of the southern Pennines (White Peak), over 200 km to the northwest. It was most probably transported by fluvial or glacial action during the Pleistocene and was recently disinterred by coastal erosion. The most diagnostic feature of screwstone cherts are the included mouldic crinoid ossicles, particularly columnals. Columnals of the monobathrid camerate crinoid Megistocrinus? globosus? (Phillips) are described from this screwstone; these have a circular outline, central pentagonal lumen and a raised perilumen. The uncertainty of the identification is... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Beachcombing; Provenance; Neogene; Carboniferous; Megistocrinus; 38.10. |
| Ano: 2010 |
URL: http://www.repository.naturalis.nl/record/361971 |
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| Donovan, S.K.; Pickerill, R.K.. |
| James speculated that Paleogene ‘flysch-wildflysch’ deposits of the Caribbean region may all have a related genesis associated with one or more bolide impacts. The principal arguments used to promote this idea were: (1) that many successions may have been dated incorrectly and are actually related to the end Cretaceous (K/T) event and/or other bolide impacts; and (2) common olistostromes may have been transported by impact-related phenomena. The deposits discussed by James included the Richmond and Font Hill formations of Jamaica. The Richmond Formation of the Wagwater Belt is Paleogene, not Cretaceous, and olistostromic blocks are a common feature of the sedimentary succession of Jamaica. No extraterrestrial event need be invoked to support their... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Jamaica; Paleogene; Richmond Formation; Tectonics; K/T event; 38.10. |
| Ano: 2009 |
URL: http://www.repository.naturalis.nl/record/314209 |
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| Winkler Prins, C.F.. |
| The role played by the geological collections of the Nationaal Natuurhistorisch Museum, the National Museum of Natural History, in documenting the developments in the Earth sciences in The Netherlands and abroad is discussed, as well as the influence exercised by the mining industry and former Dutch colonies. Thus, an overview is given of the variety of the geological collections which were obtained from government institutions, including universities, and private persons. First the early collections, which are poorly represented, are treated. An example is the Cabinet of the Stadtholder William V. Geological exploration during the 19th century, mainly in Asia, but also in the Americas, left its traces in our museum. Of special interest is the von Siebold... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Collections; Rijksmuseum van Geologie en Mineralogie; Von Siebold; Staring; K. Martin; Dubois; Jongmans; 38.10. |
| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/215476 |
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| Overweel, C.J.. |
| Detailed indicator counts in the literature on areas south and east of the Baltic were revaluated on the basis of the main ice movement directions of the last glacial in Fennoscandia. This revaluation resulted in a distribution pattern of indicators which partially coincides with the general trends of ice movement. This holds for both the Weichselian and the Saalian. The other part of the indicator distribution is of Baltic origin. The interrelationship found between flowline and distribution pattern was further analysed and elaborated, which led to a reconstruction of the directions of ice movement and outline forms of the Scandinavian ice sheets. The peripheral glacier-margin drainage was incorporated into the reconstruction, and the resulting... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.10. |
| Ano: 1977 |
URL: http://www.repository.naturalis.nl/record/317398 |
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| Registros recuperados: 10 | |
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