Describes some of the most typical of the intraformational sandstone dikes in the Numidian Flysch (Tertiary) deposits of the Kroumirie region, Tunisia. The dikes originate in sandy strata, and the youngest bed which they traverse is always argillaceous and always succeeded by a sandy layer. The fissures occupied by the dikes are attributed to earthquake shocks accompanying uplift of the adjacent land mass, which in turn caused the change in sedimentation.

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