Ichnofossils within Tetradium and related genera

Abstract
An ichnofossil formed by an organism that preferentially burrowed the micritic sediment filling corallites of tetradiids has an axial passage that may be filled with sediment or calcite spar and a surrounding affected zone of concentric structure formed by the alignment of grains. More than one such burrow may occur in a single corallite. A larger ichnofossil that destroyed both septa and walls of the corallites is associated with the smaller ichnofossils.

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