The Ingersoll shale contains a rare occurrence of Rhizocorallium in Cretaceous estuarine muds.

Ingersoll specimens are most allied with Rhizocorallium commune var. irregulare.

Ingersoll Rhizocorallium were emplaced in a firmground produced by bay-shoreline ravinement.

Ingersoll Rhizocorallium were produced by either crustaceans or worms.

Trace makers likely were suspension feeders that took advantage of bay-head wave or tidal currents.