In:
Palaeontology, Wiley, Vol. 58, No. 3 ( 2015-05), p. 563-584
Abstract:
We describe a new E arly T riassic ( G riesbachian) succession of conodont faunas from a high‐resolution sampling of the basal E arly T riassic microbial limestone and the base of the overlying unit at the W uzhuan section ( N anpanjiang B asin, G uangxi, S outh C hina). The microbial limestone records the earliest phase of the E arly T riassic biotic recovery after the end‐ P ermian mass extinction. For the first time, rich conodont faunas are reported from within the microbialite. The faunas from W uzhuan are largely dominated by anchignathodontids, including several I sarcicella species, which were previously documented only from strata above the microbialite. A total of 14 conodont species assigned to three genera is recorded from the W uzhuan section. Starting from the base of the microbialite upwards, several species are sequentially added to the conodont assemblage. The alpha diversity peaks at the top of the microbialite. The conodont record in the considered microbialite interval at W uzhuan is presumably unaffected by local ecological changes. It therefore more likely represents an evolutionary rather than an ecological pattern. We compare the W uzhuan's conodont record with a well‐supported phylogenetic model and suggest that the sequence of first occurrences at W uzhuan is the closest to the ‘true’ sequence of evolutionary events that took place during this G riesbachian radiation of anchignathodontids. Based on comparisons with the GSSP section at M eishan, we suggest further that the first occurrence of Hindeodus parvus in M eishan does not correspond to its first appearance datum.
Type of Medium:
Online Resource
ISSN:
0031-0239
,
1475-4983
DOI:
10.1111/pala.2015.58.issue-3
Language:
English
Publisher:
Wiley
Publication Date:
2015
detail.hit.zdb_id:
2034710-8
SSG:
13
