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                <term xml:lang="en">Biotic or abiogenic</term>
                <term xml:lang="en">Vindhyan</term>
                <term xml:lang="en">Boring Billion</term>
                <term xml:lang="en">Chorhat Sandstone</term>
                <term xml:lang="en">MRS</term>
                <term xml:lang="en">Biosphere</term>
                <term xml:lang="fr">« Boring billion »</term>
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                <term xml:lang="fr">Biogénique ou abiogénique</term>
                <term xml:lang="fr">Grès de Chorhat</term>
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              <p>Biogenic signatures in Precambrian rocks are often difficult to confirm and debatable. We present some unusual features associated with microbial-mat related structures (MRS) from the freshly-exposed rippled bed surface of 1.6 Ga old Chorhat Sandstone, Vindhyan Supergroup, India. The features discussed here, are present within intertidal to supratidal environments often affected by storms. One of the features includes ridge-groove couplets that run across the ripple crests. Locally, the ridge-groove couplet forms a braid-like pattern. Along the ripple troughs, the ridges are considerably long and maintain a uniform width on the mm scale. Another feature shows meandering grooves bordered by ridges. The grooves swerve, form loops, cut across older grooves, and branch up. None of them have comparable equivalents in the Precambrian record described thus far. The invariably uniform width of the ridges for both the two features cannot be compared with undersurface gas bubble migration, and the swerving and reversing nature of the grooves denies passive movement of any inorganic/organic masses under the influence of an external force. They seem to have been created by movement through a microbiota-rich surficial sediment. Such unusual features raise questions about the biosphere and biotic structures during the Boring Billion (1.8–0.8 Ga).</p>
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              <p>Les signatures biogéniques dans les roches précambriennes sont souvent difficiles à confirmer et elles sont très régulièrement débatues. Dans ce travail, nous présentons des structures inhabituelles associées aux tapis microbiens (MRS) ondulés et localisés à la surface des bancs de grès de Chorhat vieux de 1,6 Ga, bien preservés et appartenant au Supergroupe de Vindhyan, Inde. Les caractéristiques discutées sont décrites comme relevant d’environnements intertidaux à supratidaux souvent affectés par des courants de tempêtes. L’une de ces caractéristiques comprend des couplets de crêtes-rainures qui traversent des crêtes d’ondulation. Localement, le couple crêtes-rainures forme un motif en forme de tresse. Le long des creux ondulés, les crêtes sont considérablement longues et conservent une largeur uniforme à l’échelle du millimètre. Une autre caractéristique montre des rainures sinueuses bordées de crêtes. Les rainures s’écartent, forment des boucles, coupent les rainures plus anciennes et se ramifient. Aucun d’entre elles n’a d’équivalents comparables dans les archives précambriennes décrites jusqu’à présent. La largeur invariablement uniforme des arêtes pour les deux caractéristiques ne peut être comparée à la migration des bulles de gaz sous la surface. En plus, la nature déviée et inversée des rainures empêche le mouvement passif de toute masse inorganique/organique sous l’influence d’une force externe. Ils semblent avoir été formées par mouvement à travers un sédiment superficiel riche en microbiota. Ces caractéristiques inhabituelles soulèvent des questions à propos de la biosphère et les structures biotiques au cours du « Boring Billion » (1,8–0,8 Ga).</p>
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