Parahaentzschelinia Chamberlain, 1971

Diagnosis: (modified afterChamberlain, 1971): Conical burrow system with numerous mud- and sandfilled tubes radiating vertically and obliquely upward to sediment surface. The lined or unlined tubes may show a distinct meniscate fill.

Ethology. Originally attributed to the feeding activity of a worm-like animal, Parahaentzschelinia is now best explained as the trace of a tellinid bivalve (e.g., Bromley, 1996; Fig. 6E).

Description.-Full relief and epirelief structure of endogenic burrow. Numerous small, irregular, mud and sand filled tubes radiating vertically and obliquely upward to sediment surface. Galleries 1.5 mm wide, penetrate 15 to 20 mm into sand. Surface patterns 15 to 60 mm across. Apex of inverted conical structure with a narrow lateral (?) gallery. Conical depression left on upper surface of some sandstone beds where mud filled tubes have been extensively developed.