Triassic conodonts of the Slovenian Basin

Conodonts from the Early Triassic microbialite of Guangxi (South China): implications for the definition of the base of the Triassic System

Evidence from ammonoids and conodonts for multiple Early Triassic mass extinctions.

Ammonoids and conodonts, being characterized by exceptionally high background rates of origination and extinction, were vulnerable to global environmental crises, which characteristically intensified background rates of extinction. Thus, it is not surprising that these taxa suffered conspicuous mass extinctions at the times of three negative Early Triassic global carbon isotopic excursions that...

Conodonts and Biostratigraphy of Upper Ordovician Strata along a Shelf to Basin Transect in Central Nevada

Conodonts representing 38 species of 26 genera have been identified in samples from Upper Ordovician rocks at three central Nevada localities. Ranges of these species and associated graptolites are used graphically to determine correlation of the strata considered with an evolving composite standard that includes information from Ordovician strata at more than 100 localities in North America. R...

The interrelationships of ‘complex’ conodonts (Vertebrata)

SYNOPSIS Little attention has been paid to the suprageneric classification for conodonts and existing schemes have been formulated without attention to homology, diagnosis and definition. We propose that cladisticsprovidesanappropriatemethodology to test existing schemesof classification and in which to explore the evolutionary relationships of conodonts. The development of a multielement taxon...

Causes and Consequences of the Triassic-jurassic Mass Extinction as Seen from the Hartford Basin

One of the most severe mass extinctions of the Phanerozoic, the Triassic-Jurassic event is greater or equal in magnitude to that at the more famous K-T boundary (Benton, 1994) (Fig. 1). Such severity, at least for marine families is also supported by Foote’s (2003) statistical revaluations, although there remain dissenters (e.g. Hallam, 2002; Lucas et al., 2002). The cause of this mass-extincti...