Through the climatic changes, conodont
and ammonoid faunae were initially able to recover very quickly during the Early Triassic as unusually short-lived species emerged.
There are many techniques for shale maturation measurement, but the simplest and easiest is certainly the popular Conodont
Alteration Index (CAI) that can also be used with acritarch organic material.
5 m of the 6-metre sedimentary sequence of the member bears brachiopods and conodonts
, the Middle Hayden fossil locality (Fig.
In the early 1980s, paleontologists discovered conodonts
arranged near the front of an eel-like body, proving that they were parts of a larger creature -- perhaps the earliest vertebrate.
Jones (1953) and Wilson and Majewske (1960) recognized four subdivisions of the "cherty Lower Devonian" in the subsurface of the Midland Basin, in ascending order: (1) dark shale with conodonts
and spores (0-45 feet thick); (2) dark chert and cherty limestone (100-300 feet thick); (3) fossiliferous calcarenitic limestone (450 feet thick); and (4) light-colored chert and limestone (200 feet thick).
of the Kivioli Member, Viivikonna Formation (Upper Ordovician) in the Kohtla section, Estonia // Proc.
Upper Ordovician and Lower Silurian Conodonts
Revision of Silurian vertebrate biozones and their correlation with the conodont
This evidence strongly suggests that conodonts
evolved the first vertebrate dentitions.
of the lower Ordovician at Hunneberg, south-central Sweden.
The Lau Event was described on Gotland as a stepwise event with faunal turnovers that affected the conodonts
and some other fossil groups (Jeppsson 1993; Jeppsson & Aldridge 2000).
Based on this discovery and the re-evaluation of other unusually constructed conodont
feeding apparatus, the scientists developed a 3D animated model that shows how conodonts