These groups once served as vital index fossils, which made it possible to identify feasible life span to multiple strata of the Triassic strata.
22.
Some of them are useful as index fossils, such as " Favreina " from the Jurassic period of Haute-Savoie in France.
23.
Goniatites are found in North America, Europe, North Africa and Australasia where they are used as index fossils in age determination and stratigraphic correlation.
24.
It was characterised by ubiquitous plant genera such as the index fossil " Archaeopteris ", which has also been collected from Waterloo Farm.
25.
A useful index fossil, this tree is found in strata dating from the Upper Devonian to Lower Carboniferous ( ), and has a global distribution.
26.
Index fossils are species of plants or animals that existed over a wide area for a geologically short period of time ( Russell and Parks 1975 ).
27.
Through these efforts, her impact was large enough that her fossil descriptions can be used to identify index fossils for the Ordovician and Silurian geologic periods.
28.
The authors of the study recommended a reevaluation of the Green Point GSSP section, as well as possible redefinitions of the associated horizons using other index fossils.
29.
Index fossils ( also known as guide fossils, indicator fossils or zone fossils ) are fossils used to define and identify geologic periods ( or faunal stages ).
30.
He is considered to have founded the study of zone stratigraphy and the use of index fossils, a term which he created, to compare the different strata.
