Trilobites and intercontinental tie points in the Upper Cambrian of Scandinavia
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| Format: | Artículo científico |
| Language: | en |
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Universitat de Barcelona
2003
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| author | P. Ahlberg |
| author_facet | P. Ahlberg |
| contents | Trilobites and intercontinental tie points in the Upper Cambrian of Scandinavia P. Ahlberg Ciencias de la Tierra Olenidae Trilobita Agnostida Correlation Scandinavia The Upper Cambrian faunas of Scandinavia are generally dominated by olenid trilobites, which provide a firmbasis for the biostratigraphic classification. The olenids tend, however, to be provincial and facies controlled. Bycontrast, many agnostoid genera and species have a nearly worldwide distribution and are excellent biostratigraphicindices in Middle and Upper Cambrian strata. Three distinctive and geographically widely distributedagnostoid species are known from the lower part of the Upper Cambrian in Scandinavia: Linguagnostus reconditusPOLETAEVA and ROMANENKO, 1970, Aspidagnostus lunulosus (KRYSKOV in Borovikov and Kryskov, 1963),and Glyptagnostus reticulatus (ANGELIN, 1851). They are the most valuable species available for correlations withUpper Cambrian deposits outside Baltica. L. reconditus is seemingly confined to the Agnostus pisiformis Zoneand provides strong evidence for correlation of that zone with the recently defined L. reconditus Zone of Pengand Robison. G. reticulatus appears in the Olenus gibbosus Subzone and ranges up into the O. wahlenbergi Subzone,suggesting that the lower part of the Olenus/Agnostus (Homagnostus) obesus Zone correlates with the G.reticulatus Zone in, e.g., Australia, China, and Kazakhstan. The presence of A. lunulosus in the O. gibbosus Subzoneprovides additional evidence for this correlation. Higher in the sequence agnostoids become rare, and thespecies recorded from the medial and upper Upper Cambrian of Baltica permit only broad correlations with othercontinents. 2003 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50510113 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.1 Vol.1 |
| format | Artículo científico |
| id | redalyc_50510113 |
| institution | Redalyc |
| language | en |
| publishDate | 2003 |
| publisher | Universitat de Barcelona |
| spellingShingle | Trilobites and intercontinental tie points in the Upper Cambrian of Scandinavia P. Ahlberg Ciencias de la Tierra Olenidae Trilobita Agnostida Correlation Scandinavia Trilobites and intercontinental tie points in the Upper Cambrian of Scandinavia P. Ahlberg Ciencias de la Tierra Olenidae Trilobita Agnostida Correlation Scandinavia The Upper Cambrian faunas of Scandinavia are generally dominated by olenid trilobites, which provide a firmbasis for the biostratigraphic classification. The olenids tend, however, to be provincial and facies controlled. Bycontrast, many agnostoid genera and species have a nearly worldwide distribution and are excellent biostratigraphicindices in Middle and Upper Cambrian strata. Three distinctive and geographically widely distributedagnostoid species are known from the lower part of the Upper Cambrian in Scandinavia: Linguagnostus reconditusPOLETAEVA and ROMANENKO, 1970, Aspidagnostus lunulosus (KRYSKOV in Borovikov and Kryskov, 1963),and Glyptagnostus reticulatus (ANGELIN, 1851). They are the most valuable species available for correlations withUpper Cambrian deposits outside Baltica. L. reconditus is seemingly confined to the Agnostus pisiformis Zoneand provides strong evidence for correlation of that zone with the recently defined L. reconditus Zone of Pengand Robison. G. reticulatus appears in the Olenus gibbosus Subzone and ranges up into the O. wahlenbergi Subzone,suggesting that the lower part of the Olenus/Agnostus (Homagnostus) obesus Zone correlates with the G.reticulatus Zone in, e.g., Australia, China, and Kazakhstan. The presence of A. lunulosus in the O. gibbosus Subzoneprovides additional evidence for this correlation. Higher in the sequence agnostoids become rare, and thespecies recorded from the medial and upper Upper Cambrian of Baltica permit only broad correlations with othercontinents. 2003 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50510113 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.1 Vol.1 |
| title | Trilobites and intercontinental tie points in the Upper Cambrian of Scandinavia |
| topic | Ciencias de la Tierra Olenidae Trilobita Agnostida Correlation Scandinavia |
| url | https://www.redalyc.org/articulo.oa?id=50510113 |