Cambro-Ordovician sea level fluctuations and sequence boundaries: the missing record and the evolution of new taxa

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Lehnert O, Miller JF, Leslie SA, Repetski JE, Ethington RL
Zeitschrift: Special Papers in Palaeontology Series
Verlag: Journal Subscription Department
Jahr der Veröffentlichung: 2005
Heftnummer: 73
Seitenbereich: 117-134
ISSN: 0038-6804


Abstract

The evolution of early Palaeozoic conodont faunas shows a clear connection to sea-level changes. One way that this connection manifests itself is that thick successions of carbonates are missing beneath major sequence boundaries due to karstification and erosion. From this observation arises the question of how many taxa have been lost from different conodont lineages in these incomplete successions. Although many taxa suffered extinction due to the environmental stresses associated with falling sea-levels, some must have survived in these extreme conditions. The number of taxa missing in the early Palaeozoic tropics always will be unclear, but it will be even more difficult to evaluate the missing record in detrital successions of higher latitudes. A common pattern in the evolution of Cambrian-Ordovician conodont lineages is appearances of new species at sea-level rises and disappearances at sea-level drops. This simple picture can be complicated by intervals that consistently have no representatives of a particular lineage, even after extensive sampling of the most complete sections. Presumably the lineages survived in undocumented refugia. In this paper, we give examples of evolution in Cambrian-Ordovician shallowmarine conodont faunas and highlight problems of undiscovered or truly missing segments of lineages. © The Palaeontological Association.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Lehnert, Oliver PD Dr.
Professur für Paläontologie (Schwerpunkt Faziesanalyse)


Einrichtungen weiterer Autorinnen und Autoren

Missouri State University
United States Geological Survey (USGS)
University of Missouri-Columbia (Mizzou)
University of Wisconsin - Madison


Zitierweisen

APA:
Lehnert, O., Miller, J.F., Leslie, S.A., Repetski, J.E., & Ethington, R.L. (2005). Cambro-Ordovician sea level fluctuations and sequence boundaries: the missing record and the evolution of new taxa. Special Papers in Palaeontology Series, 73, 117-134.

MLA:
Lehnert, Oliver, et al. "Cambro-Ordovician sea level fluctuations and sequence boundaries: the missing record and the evolution of new taxa." Special Papers in Palaeontology Series 73 (2005): 117-134.

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