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GSA Special Papers
Conodont Biofacies and Provincialism
Author(s)
Copyright:
© 1984 Geological Society of America
Geological Society of America
Geological Society of America

Volume
196
ISBN print:
9780813721965
Publication date:
January 01, 1984
Book Chapter
Cambrian and earliest Ordovician conodont evolution, biofacies, and provincialism
Author(s)
-
Published:January 01, 1984
Conodonts are divided into three groups with different histologies: protoconodonts (most primitive), paraconodonts, and euconodonts (most advanced). The first is poorly known, but paraconodonts included a Westergaardodina and a coniform evolutionary lineage, and each was the ancestor of one or more euconodont lineages. Early euconodonts are thus polyphyletic and included the Proconodontus and Tendonitis Lineages, which appeared in the middle Late Cambrian, and the Fryxellodontus and Chosonodina Lineages, which appeared in the Early Ordovician. Major changes in conodont evolution, biofacies adaptation, and development of provincialism coincided with sea-level fluctuations near the end of the Cambrian (here named the Lange Ranch...
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Index Terms/Descriptors
- biofacies
- biogeography
- biologic evolution
- Cambrian
- Conodonta
- global
- Lower Ordovician
- microfossils
- new taxa
- Ordovician
- paleogeography
- Paleozoic
- provinciality
- Tremadocian
- protoconodonts
- Fryxellodontus
- paraconodonts
- euconodonts
- Westergaardodina
- Teridontus
- Chosonodina
- Lange Ranch Eustatic Event
- Phakelodus
- Proeonodontus
- Oneotodus tenuis
- Black Mountain Eustatic Event
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