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| Jagt-Yazykova, E.A.. |
| Both faunal endemicity and provincialism in the mid- and Late Cretaceous of the Pacific realm complicate the recognition of stage boundaries in that area. Correlations with other areas (e.g., Europe, United States Western Interior, Pacific coast of North and South America) therefore have to rely solely on event stratigraphy; not only extinctions, but all biotic events must be considered. During the Cretaceous, Pacific faunas were characterised not so much by the presence of typical ‘Boreal’ assemblages, but rather by the absence or extreme paucity of other widely distributed biota. Clearly, faunal similarities depended more on regional facies development than on their spatial distribution. The regional diversity curve reflects all global mass extinctions,... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Ammonoides; Cretaceous; Palaeobiogeography; Palaeobiology; Correlations; Russian Pacific; 38.22; 42.73. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/428480 |
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| Jagt, J.W.M.. |
| The palaeobiology of echinoderms occurring in the Meerssen and Geulhem members is discussed and changes in diversity across the K/T boundary are documented. Using literature data on the ecology of extant faunas, the various echinoderm groups are considered. Naturally, such data can only be applied with due caution to fossil forms, whose skeletal morphology is often incompletely known. This holds especially true for asteroids, ophiuroids, and crinoids, which, upon death, rapidly disintegrate into jumbles of dissociated ossicles. Bioturbation, scavenging, and current winnowing all contribute to blurring the picture still further. However, data on extant forms do allow a preliminary subdivision of fossil species into various ecological groups, which are... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Echinodermata; Late Cretaceous; Early Palaeogene; Palaeobiology; K/T boundary; Extinction; 42.72; 38.22. |
| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/219135 |
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