[1] Incognitoolithus fragments are found at two localities in the DeBeque Formation in Garfield County, Colorado.

[1] Multiple fragments of Incognitoolithus have been found with holes interpreted as peck marks.

While it is possible that these were made by a parent assisting the hatching, this behavior is very rare in modern birds.

Experiments on modern chicken eggs by Hirsch et al. in 1997 found that Incognitoolithus's holes are most consistent with those from a bird's peck.

However, the dynamics of a thick eggshell like I. ramotubulus differ from those of chicken eggs, so the possibility that the holes are tooth marks of a mammal or reptile cannot be ruled out.