International Field Workshop on 'The Triassic of eastern France'

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Rotliegends by the typical-Zechstein carbonate-evaporite facies (Uppermost Permian), in France the latter are completely lacking. This is why the French geologists place the base of their ‘Buntsandstein’ at the level of a major unconformity between fanglomerate prone deposits, localised in relatively restricted basins, and widespread fluvial deposits (Courel et al. 1980). Such a concept of ‘Buntsandstein’ prevailed in South Germany until the adoption of a unified lithostratigraphic scale (Richter-Bernburg, 1974). Thus, in the French sedimentary basins, deposits referred to as ‘Buntsandstein’ can be attributed either to Permian or to Triassic (Durand, 2006). Actually, the ‘Lower Buntsandstein’ of the Vosges (Senones Sandstone and Anweiller Sandstone) can be attributed to the Upper Permian, i.e. Zechstein equivalents (Durand et al., 1994). Figure II.1: (A) Location of the studied area and the Bockenem well (Bo) and (B) Location of studied wells and lower Triassic transect. B: Bertray1; G: Granville 109; M: Montplone1; F: Francheville1; L: Lorettes1, S: Saulcy; J: Johansweiller; SSF: Soultz-sous-Forêts, K: Kraichgau; E: Emberménil. After Bourquin et al., 2006. Therefore, the Middle and Upper Buntsandstein units are attributed mainly to the Lower Triassic. These facies are characterized by fluvial deposits that make up the following formations (Fig. II.2), from base to top (Courel et al., 1980): ‘Conglomérat basal’, ‘Grès vosgiens’, ‘Conglomérat principal’, ‘Couches intermédiaires’, and ‘Grès à Voltzia’. The ‘Couches intermédiaires’ Formation is commonly separated from the ‘Conglomérat principal’ by the ‘Zone limite violette’ Formation that is characterized by the first occurrence of Triassic soils in this area. The bed-load fluvial systems of ‘Conglomérat basal’, ‘Grès vosgiens’ and ‘Conglomérat principal’ are attributed to braided type networks developed in an arid climatic environment, as indicated by the occurrence of reworked and in situ aeolian sand dunes and wind worn pebbles (Durand, 1972, 1978; Durand et al., 1994). The bed-load fluvial deposits of the ‘Couches intermédiaires’ correspond to low sinuosity rivers with transverse bars (Durand, 1978), and are associated with hydromorphic paleosols (Durand 1978; Durand and Meyer, 1982). The ‘Grès à Voltzia’ shows an evolution from low sinuosity fluvial systems in the ‘Grès à meules’, with weak marine influence, to the fluvio-marine environment of the ‘Grès argileux’ (Gall, 1971; Durand, 1978; Courel et al., 1980; Durand et al., 1994). The only biostratigraphic evidence in this Buntsandstein series concerns the ‘Grès à Voltzia’, where macrofauna and palynoflora allow the attribution of a Lower to Middle Anisian age according to 12
location (Durand and Jurain, 1969; Gall, 1971). Paleocurrent directions obtained from fluvial facies indicate a mainly eastward flow (Durand, 1978). Figure II.2: Lithostratigraphic column, sedimentary environment variations, major and minor stratigraphic cycles for the Lower Triassic succession in the eastern part of the Paris Basin based on Emberménil well (after Bourquin et al., 2006). The terminology used for the Buntsandstein formations in the Palatinate is not the same as that applied in the Paris Basin. The equivalent of the ‘Grès vosgiens’ Formation is divided into three units, which are, from base to top: the Trifels, Rehberg, and Karlstal formations. These three units are characterized by increasing clay content. Recent study from well-log data for the Triassic west of the Black Forest (Paris Basin, Rhine Graben and Bresse-Jura Basin) allows us to propose correlations and define the stratigraphic context of the Lower Triassic units (Bourquin et al., 2006). 13
Page 1: Pan-European correlation of the epi
Page 4 and 5: DAY 3 — THURSDAY, 05.10.2006 ....
Page 6 and 7: Excursions Tuesday, 03.10 2006 Stop
Page 9 and 10: I. - Introduction The Triassic of e
Page 11: Figure I.1: Lithostratigraphic colu
Page 15 and 16: Figure II.4: A) Geometries and lith
Page 17 and 18: Silurian and Proterozoic graphitic
Page 19 and 20: (Durand and Jurain, 1969; Gall, 197
Page 21 and 22: sedimentary break period of by-pass
Page 23 and 24: Figure II.11: Climate simulations f
Page 25 and 26: Figure III.1: (A) E-W Muschelkalk s
Page 27 and 28: IV. The Keuper IV.1. - Geological s
Page 29 and 30: Figure IV.1: Lithostratigraphy, sed
Page 31 and 32: Figure IV.2: (A) Maps of the retrog
Page 33 and 34: Figure IV.4: (A) Maps of retrograda
Page 35 and 36: 4.2.6. Upper ‘Marnes irisées sup
Page 37: Dolomites (Aigner and Bachmann, 199
Page 40 and 41: layers, with frequent mud-cracks th
Page 42 and 43: Figure 3: (A) Early Triassic palaeo
Page 44 and 45: Landscape reconstruction for the An
Page 46 and 47: Figure 8: Correlations between Hemi
Page 48 and 49: Figure 10: Aeolian dune facies obse
Page 50 and 51: Day 2 — Wednesday, 04.10 2006 Sto
Page 52 and 53: Stop 2.2 - Relanges (quarry along D
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Page 56 and 57: Stop 2.6 - Poussay (D55 road cuttin
Page 58 and 59: Stop 2.8 - Xirocourt (S.R.D.E. quar
Page 60 and 61: The first one crops out in old quar
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Figure 33: Outcrop of the old gypsu
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Stop 3.6 - Saint-Avold (N3 road cut
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Stop 3.8 - Grosbliederstroff (N61 r
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Stop 4.2 - Volmunster-Lengelsheim:
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Stop 4.3 - Bitche (N62 road): Harde
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Figure 46: Sedimentary log of Bitch
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supported by the occurrence of biot
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Figure 49: Detailed view of the aeo
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Dittrich D. (1989). Beckenanalyse d
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Simms M.J., Ruffell A.H. (1990). Cl
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International Field Workshop on 'The Triassic of eastern France'

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