Oogenus: Montanoolithus ZELENITSKY & THERRIEN, 2008
Etymology: After Montana, the state for which the clutch was collected, and from Greek, oon, 'egg', and Greek, lithos, 'stone'.

Oospecies: strongorum ZELENITSKY & THERRIEN, 2008
Etymology: In honor of Richard and Donna Strong, who kindly supported this project.

Holotype: RTMP 2007.A.1

Locality: C. 22 km SSW of Cut Bank, Blackfeet Reservtion, Glacier County, Montana.

Horizon: Two Medicine Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: A nesting trace and 5 partial eggs of an in situ clutch.

Referred material:

RTMP 94.157.30-37, 85.17.1, 2004.31.6: Small eggshell fragments.