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| Registros recuperados: 29 | |
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| Boogaard, M. van den; Kuhry, B.. |
| Extensive frequency data are used for a reconstruction of Devonian cunodont apparatuses. Correspondence analysis and a related clustering method are selected as statistical tools, and are used as informal methods for testing a priori hypotheses rather than as search mechanisms. In our view, the Palmatolepis apparatus consists of palmatolepan P elements, tripodellan or nothognathellan O elements, palmatodellan and smithiform N elements, and a symmetry transition consisting of falcodontan A1 elements, asymmetrical scutulan A2 elements, and symmetrical scutulan A3 elements. A peculiar phenomenon, already described by other authors, is the numerical dominance of the P elements, which are on the average 15 times as frequent as corresponding O and N elements. It... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1979 |
URL: http://www.repository.naturalis.nl/record/317498 |
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| Kreveld, S.A. van. |
| Primary productivity and water mass reconstructions based on planktic Foraminifera reveal distinct interglacial/glacial variations for the past 208 ka in a mid-latitude Northeast Atlantic piston core. Average total planktic foraminiferal absolute frequencies and accumulation rates, which are interpreted to reflect primary productivity, are higher in interglacial than in glacial sediments. Low total planktic foraminiferal absolute frequencies and accumulation rates in 'Heinrich layers' are likewise interpreted to show low production of Foraminifera due to low surface ocean fertility. 'Heinrich layers' are enriched in ice-rafted debris, recording periods of massive iceberg production and rapid melting in the Northeast Atlantic. The dominance of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1996 |
URL: http://www.repository.naturalis.nl/record/317525 |
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| Bock, J.F. de. |
| The primary differentiation within the genus Miogypsina is based on features seen in vertical sections. The subgenus Miogypsinoides lacks lateral chambers and the equatorial plane is covered on each side by zones of massive laminae, whereas the subgenus Miogypsina has well-developed lateral chambers on each side of the equatorial layer. Miogypsinoides shows an intraseptal canal system, due to the presence of a toothplate and a septal flap which are not found in Miogypsina s.s. Several samples contained specimens which show the possible transition from Miogypsinoides to Miogypsina s.s. The disappearance of the septal flap and the toothplate in Miogypsina was probably simultaneous with the appearance of lateral chambers. It seems that the existence of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1976 |
URL: http://www.repository.naturalis.nl/record/317461 |
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| Hoek Ostende, L.W. van den. |
| Having been described in 1904 by Dubois as a locality for fossil mammals, the Tegelen clay-pits are nowadays considered a ‘classical’ locality. It is the type locality of the Tiglian, a warm period of the Early Pleistocene or Late Pliocene. The pits are primarily known for their mammalian remains, but have also yielded seeds, pollen and freshwater snails. A century of collecting has resulted in extensive collections of large mammals in various museums, the most important of which are the Teylers Museum, Haarlem and the National Museum of Natural History Naturalis in Leiden. The latter museum also holds a large collection of microvertebrates, collected during campaigns in the 1970s. These campaigns showed that, in spite of the numerous fossils, the Tegelen... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Tegelen; Tiglian; Pleistocene; Fossil mammals; 38.20. |
| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/215458 |
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| Krijnen, J.P.. |
| In the present paper, certain morphological features and the ontogenetical development of members of the subfamily Pseudorbitoidinae Rutten, 1935 are discussed. A study of the evolution of Pseudorbitoides Douvillé, 1922 resulted in testing the concept of nepionic reduction in populations of this genus from Jamaica (Green Island- and Sunderland Inlier) and Curaçao (Cas Abao Limestone lenses). Within the Pseudorbitoides-lineage, P. trechmanni pectinata subsp. nov. is distinguished from P. trechmanni trechmanni Douvillé on account of different post-juvenile features. |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/317459 |
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| Agustí, J.; Arenas, C.; Cabrera, L.; Pardo, G.. |
| The occurrence of Ramys cf. perezi in the Miocene sequences of the Central Ebro Basin allows to locate the Aragonian-Vallesian transition (Late Miocene) in the alluvial and lacustrine sequences which make up the upper part of the basin sediments in the Sierra Alcubierre. These new data determine the age of the upper genetic unit defined in the central basin sectors, and mark the relationships between the Ebro Basin faunal assemblages and those from other Spanish basins included in the Central Iberian palaeobiogeographic province (e.g. Teruel and Duero Basins). |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1994 |
URL: http://www.repository.naturalis.nl/record/317510 |
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| Hinte, J.E. van; Ruffman, A.; Boogaard, M. van den; Jansonius, J.; Kempen, T.M.G. van; Melchin, M.J.; Miller, T.H.. |
| Orphan Knoll is an isolated, drowned continental fragment 550 km northeast of Newfoundland. The top of Orphan Knoll stands at 1800 to 2000 m and is marked by a series of protruding mounds. Dredging at the base of one of the mounds in 1971 obtained a suite of fossiliferous limestone pebbles that are interpreted to reflect nearby bedrock. The shallow marine limestone facies include mudstone, wackestone, packstone, and grainstone. The pebbles yielded Late Ordovician, Silurian and Devonian conodonts, as well as Ordovician/Silurian scolecodonts, chitinozoans and graptolites. Similarly, sponge spicules suggest the presence of Late Ordovician as well as Middle Devonian material including a Silicunculus-type of hexactinellid anchoring basalia and an octactine... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1995 |
URL: http://www.repository.naturalis.nl/record/317524 |
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| Blissett, D.J.; Pickerill, R.K.. |
| The Middle Eocene to Middle Miocene White Limestone Group of Jamaica contains a common and diverse, poorly to well-preserved microboring ichnofauna, namely Centrichnus eccentricus Bromley & Martinell, Curvichnus pediformis isp. nov., Dendrorete balani Tavernier, Campbell & Golubic, Dipatulichnus rotundus Nielsen & Nielsen, Entobia volzi Bromley & D’Alessandro, Entobia isp. cf. E. ovula Bromley & D’Alessandro, Entobia isp. forms A and B, Fossichnus solus Nielsen, Nielsen & Bromley, Maeandropolydora elegans Bromley & D’Alessandro, Maeandropolydora sulcans Voigt, Oichnus asperus Nielsen & Nielsen, Oichnus excavatus Donovan & Jagt, Oichnus gradatus Nielsen & Nielsen, Oichnus ovalis Bromley, Oichnus paraboloides Bromley,... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Ichnotaxonomy; Microborings; Jamaica; West Indies; Eocene; Oligocene; Miocene; 38.20. |
| Ano: 2007 |
URL: http://www.repository.naturalis.nl/record/217416 |
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| Bock, J.F. de. |
| In spite of the generally poor preservation of the specimens, it could be observed that in many specimens the large, often somewhat trochoid spiral out of PA-I, surrounding I and II, passes the small spiral out of PA-II without forming a closing chamber. In several specimens the vertical section shows that the embryonic-nepionic apparatus forms an angle with the equatorial plane. This makes it difficult to distinguish in a horizontal thin section a spiral chamber from an equatorial or lateral chamber. The sample used contained numerous microspheric specimens, which are markedly different from the megalospheric specimens both externally and internally. The difference between the subgenera Miogypsina and Miolepidocyclina is discussed. |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1977 |
URL: http://www.repository.naturalis.nl/record/317497 |
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| O'Herne, L.. |
| Foraminiferal collections from Java and Borneo stored in the Netherlands National Museum of Geology and Mineralogy in Leiden enables to study the range of variation in Lepidocyclina ferreroi and L. multilobata. Taken separately many features considered typical of L. multilobata and L. ferreroi are insufficient to identify the specimens. When typically developed both species are highly characteristic and easily distinguished. Transitional forms however cannot be classified with certainty. Possibly L. multilobata has evolved from L. ferreroi but too little is known about the ages of the two species, especially of L. multilobata. L. crucifera is probably a form of L. ferreroi with four rays distinguished by the development of more than one tubercle on each... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1976 |
URL: http://www.repository.naturalis.nl/record/317538 |
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| Marcos, A.; Azor, A.; González, F.; Simancas, F.. |
| Three ichnogenera are described from a 50 to 500 m thick shallow-water sandstone-shale sequence (Sierra Albarrana Quartzites). The ichnofauna consists of the burrows of worm-like animals (Arenicolites, Monocraterion, and Skolithos). The age of this formation, previously considered to be Precambrian or Palaeozoic, has been the subject of discussions. We may now assign it an Early Phanerozoic age, in agreement with the known stratigraphic distribution of the ichnofossils found. |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1991 |
URL: http://www.repository.naturalis.nl/record/317447 |
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| Boogaard, M. van den. |
| An investigation of some faunas rich in Milaculum Müller, 1973 lead to the conclusion that the Milaculum animal was - at least partly - covered by plates of different morphology. Several specimens of Milaculum were encountered with adhering smaller platelets showing that the epidermal tissue of this animal consisted of a mosaic of larger and smaller plates. The characteristics of the material encountered are suggestive of an agnathan affinity of Milaculum. Two new species are described, Milaculum balticum from the Upper Ordovician of Estonia and M. longmyndium from the Lower Silurian of the Welsh Borderland. |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1988 |
URL: http://www.repository.naturalis.nl/record/317535 |
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| Harper, D.A.T.. |
| Geological collections were established in the University of Copenhagen during the early 1700s with the presentation of fossil, mineral and rock collections by Count A.G. Moltke, mainly assembled by Ole Worm (1588-1654) in his Museum Wormianum. Currently the palaeontological collections in the Geological Museum, alone, contain over 1 million specimens, including 26,000 types. The focus of the collection remains on material from Denmark and Greenland. Highlights from Greenland include evidence of early life from the Archaean Isua Complex, the early Cambrian Sirius Passet fauna, Devonian amphibians, Triassic dinosaurs, mammals and pterosaurs, Jurassic and Cretaceous ammonites together with Jurassic and Cretaceous plants. The Danish collections are dominated... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/317353 |
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| Kleijne, A.. |
| Rhabdosphaerids were consistently present as a minor constituent of the 1985 summer coccolithophorid flora in surface waters of the Indian Ocean, Red Sea, Mediterranean Sea and North Atlantic. Sixteen taxa are identified, belonging to seven genera, including the two new combinations Cyrtosphaera aculeata and C. cucullata and the new species C. lecaliae sp. nov. of Cyrtosphaera gen. nov., and the new combination Anacanthoica cidaris. An emended description is given for the genus Acanthoica, of which the new species A. biscayensis and a type in open nomenclature are described. All species are illustrated by SEM-micrographs and their occurrences are mapped. The most frequently occurring species were Palusphaera vandeli, present in low numbers along the entire... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 38.20. |
| Ano: 1992 |
URL: http://www.repository.naturalis.nl/record/317515 |
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| Registros recuperados: 29 | |
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