Abstract
The following species of conodont have been recovered from English Zechstein (EZ) rocks: Merrillina divergens (Bender & Stoppel), Merrillina sp., Mesogondolella phosphoriensis (Youngquist, Hawley & Miller),?Mesogondolella phosphoriensis, Xaniognathus abstractus (Clark & Ethington), Xaniognathus spp. And Prioniodina? sp. One element remains unassigned. Horizons yielding Mesogondolella phosphoriensis and Merrillina divergens correlate with sequences containing the same species in North America and Asia, and with Zechstein beds in Europe. Elements recovered from British Late Triassic sequences are referred to Misikella posthernsteini Kozur & Mock, Misikella coniformis nom. nov., Chirodella verecunda sp. nov. and Prioniodina? spp. Misikella posthernsteini allows correlation with sequences in Europe, North America and the Far East. Thermal maturation levels are low in the Late Permian and very low in the Late Triassic. Both British Permian and Triassic conodont faunas responded to environmental changes. Late Triassic forms are amongst the last known in the conodont record, are extremely small and may be vestigial.
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