Both the Lateritic and Oolitic units show an overprinting secondary ferruginisation, often seen as resistant vertical and horizontal bands which have exploited bedding and fracture surfaces, and as concentric zonations
within the units and typically between ferruginous fractures.
Among the diverse Emsian zonations
, the one based on the successive occurrence of different species of the genus Polygnathus is the most commonly used for biostratigraphical subdivisions and world-wide correlations (see, for example, Klapper and Johnson, 1975; Klapper, 1977; Weddige and Ziegler, 1977; Lane and Ormiston, 1979; Yolkin et al., 1994, Bardashev et al, 2002).
Accordingly, there is a good correspondence between conodont zonations
of these areas, and most of the zones distinguished in Sweden can be recognized in Estonia (Viira et al.
Dempster comments on how the simple model for zonations
in the concept of a biosphere reserve has been interpreted in so many different ways to fit with the place-based and situation-specific contexts of individual biosphere reserves.
Here we report a study on the use of this technique to map trace elements in homogenized liver and in thin sections of sheep liver and show that copper shows zonations
whereas zinc is reasonably constant.
This was achieved by cross-correlating biostratigraphic zonations
deduced from paleontological studies with the magnetic polarity sequences observed in sedimentary sections and revealed from the magnetic stripes of the seafloor.
martinssoni Zone in the upper Homerianlowermost Gorstian are geographically widely distributed in the Baltica, Laurentia and Kara palaeocontinents and allow uniting regional zonations
into one Generalized Vertebrate Zonation
The use of Globorotalia crassaformis subspecies in biostratigraphical zonations
Recognition of various ecological associations of conodonts has resulted in different local conodont zonations
for shallow and deeper shelf environments of some stratigraphical intervals (Viira 1982).
The definitions of the series and stages of the Silurian System and their correlation are traditionally based on relatively well developed graptolite zonation
. The Silurian conodont zonation
is rather a complementary correlation tool that is, in general, more complicated because of facies constraints and a high degree of provincialism at some stratigraphic levels caused by diverse palaeo-environmental settings.