Tindi Fm

For type locality, see In-Azaoua Gr . Joulia (1959) describes it without naming it. Claret & Tempère (1968) name it the “Tigillites sandstones" or "Pachydermal sandstones”. Abdoulaye et al. (2007) rename it “Tindi Formation”

References: Joulia, 1959; Freulon, 1964, p. 47; Claret & Tempère, 1968; Beuf et al., 1971; Fabre et al., 1983; Abdoulaye et al., 2007.

Synonym: "Tigillites sandstones"; "Pachydermal sandstones" [It is often eroded in “dos d’éléphant” (elephant’s back) thus its frequent appellation of “grès pachydermiques” (Pachydermal sandstones)]; “Grès à Tigillites”

Equivalent(s): Most likely the Hawaz Fm of the Djado Basin due to its high content in Tigillites (trace fossil).

See In-Azaoua Gr. Joulia (1959a) defines these sandstones as a Member with a facies quite similar to that of the overlying In Azaoua Fm, but more massive and sparsely stratified, containing very numerous tigillites (trace fossil). For Freulon (1964), this cycle includes fine light sandstones in the middle of which appear several levels with tigillites. These sandstones seem to flood an old, eroded surface; the facies and thicknesses are varied. The tigillite levels are not homogeneous; large lenses of white sandstone with ripple marks are inserted therein. He considers that these sediments were deposited under a water depth greater than the sandstones at Harlania (Akakus Fm in the Djado Basin). Beuf et al. (1971), in their work on the sedimentation of the Lower sandstones (In-Azaoua Gr), study the distribution of tigillites and come to different conclusions. Like its equivalent, the Scolith sandstones, this cycle indicates a facies and therefore cannot correspond to a defined stratigraphic level.

Tigillites (trace fossil)

Marine