International Field Workshop on 'The Triassic of eastern France'

(Durand and Jurain, 1969; Gall, 1971). For example, the ‘Grès à Voltzia’ are located in the lower part of
cycle B7 in the Johansweiller well, but in the upper part of this cycle farther eastwards (Fig. II.8). Moreover,
these correlations point out the lateral evolution from dolomitic and anhydritic clays, attributed to shallow
marine and sabkha facies, in the eastern edge of the studied area (Gall, 1971; Durand, 1978; Courel et al.,
1980, Durand et al., 1994), to sandstones in the west. Geometrically, the transect reveals the landward
migration - i.e to the west - of dolomitic clay facies (marine deposits) in a major retrogradational trend (Fig.
II.3). The upper part of the cycle B7 is characterized by first occurrence of anhydritic deposits (landward
equivalent of dolomitic facies observed in the Soultz-sous-Forêts well) overlying previous marine facies in a
retrogradation trend (Fig. 4). Two detailed facies maps are drawn up for this cycle, one in its lower part,
which correspond to the ‘Grès à Voltzia’ Formation of Lorraine outcrops and Emberménil well (Figs. II.2
and II.7), and the other in its upper part which correspond to the Lower Muschelkalk formations and
‘Couches rouges’ Formation of Lorraine outcrops and Emberménil well. These two maps show the westward
migration of the paleoenvironments and the geographic distribution of the two facies of the ‘Grès à Voltzia’
(Grès à Meules’: sandstone facies, Fig. 7B, and ‘Grès argileux’: silty clay facies, Fig. II.7B). The fluvial
systems are localized mainly along the basin border (previous basement area) and evolved basinwards into
shallow marine deposits (Fig. II.7B, C).
Figure II.8: E-W correlations of the Upper Buntsandstein stratigraphic cycles showing the diachronous nature of
the formations. See location Fig. I.1B. After Bourquin et al., 2006.
II.3. – Comparison with other parts of the German Basin
The comparison with the central Germanic Basin cycles (Fig. II.9) is carried out by correlating the
Soultz-sous-Forêts and Kraichgau 1002 wells and then the combined well-logs for Bockenem 1 and
Bockenem A100 (Fig. 3 of Aigner and Bachmann, 1992).
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