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SUBDIVISION OF THE ARUKULA STAGE ON THE BASIS OF LITHOLOGICAL AND MINERALOGICAL CRITERIA

1994; Estonian Academy Publishers; Volume: 43; Issue: 2 Linguagem: Inglês

10.3176/geol.1994.2.01

1736-7913

A Kleesment,

Linguistics and Cultural Studies

In the Baltic Region the Aruküla Stage (Eifelian) is characterized by reddish brown cross-bedded sandstone interbedded with siltstone, clay, and domerite.In Estonia it is represented in excellent fossil-bearing outcrops and in a number of borings.The thickness varies from 62.5 to 90 ш.In 1981 the Arukiila Stage was divided into two members.More recent and revised earlier lithological and mineralogical data have permitted to distinguish three cycles.These cycles are observable in all sections of the Baltic and Leningrad District, corresponding thus to evolutionary stages of the area and serving as a basis for the distinction of three beds in the Arukiila Stage Viljandi (the lowest), Kurekiila (the middle), and Tarvastu (the uppermost one).Lithological and mineralogical criteria have been established to discriminate these beds.