Oogenus: Oblongoolithus MIKHAILOV, 1996
Etymology: Latin, oblongus, "elongate" and Greek, oolithus, root of generic names of fossil eggs.

Oospecies: glaber MIKHAILOV, 1996
Etymology: Latin, glaber, "with smooth surface."

Holotype: PIN 3142-500/1

Locality: Hermiin Tsav (Khermeen Tsav), western Ömnögov (South Gobi), Mongolia.

Horizon: Barun Goyot Formation.

Biostratigraphy:

Age: Middle –Late Campanian Stage, Senonian Subepoch, Gulf Epoch, Late Cretaceous..

Material: Fragment of broken egg, including one pile.

Six fragments of broken egg of one clutch from one locality.

(eggs with dinosauroid-prismatic basic shell type)