Occurrences of Psammichnites are of particular interest not only because of their unique biostratigraphic attributes underlying the oldest Cambrian trilobites in the Montagne Noire (southern France), but also because of their environmental significance. They are compared with other Lower Cambrian Psammichnites found elsewhere, particularly in siliclastic-dominant platforms of south-western Europe, in which this ichnogenus occurs from late Tommotian to middle Atdabanian (Siberian chart) or late Cordubian to middle Ovetian (Iberian scale) times.

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