Revision of Silurian vertebrate biozones and their correlation with the conodont
The same pattern of several diversification pulses of merely 1-2 Ma durations have also been reported in other taxonomic groups, such as conodonts
, benthic foraminifers, and ichnofaunas (see Romano et al., 2012 for references).
Our focus in this study is on the conodonts
that we extracted from this geographically restricted lens of shale overlying the Bucktown Coal.
According to conodonts
, this biozone's age was Scythian.
Nowlan, G.S., and Thurlow, J.G., 1987, The significance of Middle Ordovician conodonts
from the Buchans Group, in Kirkham, R.V., ed., Buchans Geology, Newfoundland: Geological Survey of Canada, Paper 86-24, p.
Collections of conodonts
are deposited in the Institute of Geology at Tallinn University of Technology.
-- Kozur (1990b) established this genus for conodonts
exhibiting a gondolellid apparatus in which the platform elements display a subterminal pit, marginal ridges on the otherwise flat keel, and a distinct free blade.
Last year, scientists at Leicester University in England demonstrated that enigmatic fossils known as conodonts
in fact represent the earliest known vertebrates.
However, in collaboration with colleagues he has been studying various fossil groups such as chitinozoans, acritarchs, brachiopods, conodonts
, early vertebrates, tabulate corals, stromatoporoids and other typical members of Palaeozoic faunas.
Sweet (1970) studied the uppermost Permian and lower Triassic conodonts
of the Salt Range and Trans Indus Range.
For instance, Martinez-Perez and Valenzuela-Rios (2014) describe the adaptive radiation during the Early Devonian of polygnathid conodonts
from the Spanish Central Pyrenees, with the identification of several new species.
Several reports have been concerned with the palaeontology of foraminifera, corals, brachiopods, conodonts
and cephalopods of the Ali Bashi Formation and formations from the same stage in Alborz and Abade.