Diagnosis: Shallow. roughly circular pits in carbonate substrates. The peripheral edge of the pit is sharp, the walls of the pit are perpenticular to or overhanging the substrate surface. The edges of some pits are undulated, the pit bottom is moderately concave. The diameter of pit is usually 10-40mm, their depth 3-10mm. The pits often occur in major groups, in some cases touching one  another.

Unbranched, circular.

Category of architectural design: 2.63. Circular holes and pit-shaped borings.