CoachAn ichnofacies is a recurrent association of trace fossils that reflects a set of environmental conditions; it is named after a characteristic trace.
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Example 20.10 (The base of the Varden cover)
The sandstone holds channel fills on scoured bases, roots and plant fragments, and no marine fossil: it was laid down by rivers on land. The oolitic limestone above has cross-bedded ooids, which grow as they roll in agitated water, vertical tubes and U-shaped burrows of the Skolithos ichnofacies, and worn shell fragments, all allochthonous: a shoal of the shoreface, swept by waves. Between the two the sea arrived: the contact records a marine transgression. In the order of Walther’s law, the river plain was followed by the shore, then the shoal.