Oogenus: Spongioolithus BRAY, 1999
Etymology: Named for the squamatic region of the eggshell that in the past has often been referred to as the spongy layer of the avian egg.

Oospecies: hirschi BRAY, 1999
Etymology: In honor of Karl F. Hisrsch, whose work on amniotic eggshell greatly advanced the structural classification of fossil eggshell.

Holotype: UCM 476720

Locality: UCM lL79058, One Egg Locality, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Holotype and HEC 246: 413 eggshell fragments.

Referred material:

Locality: Section 4 site 7, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HEC 296: 45 fragments.

 

 

Locality: Kitchen Locality, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HEC 759: 19 fragments.

 


Locality: Sauropod locality, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HEC 762-1: 13 fragments.

HEC 763: 6 fragments.

HEC 79 (UCMP 88127) : Eggshell fragments.

 

 

Locality: Sauropod one egg, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HEC 765: 9 fragments.

 

 

Locality: Pond locality, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HEC 766: Eggshell fragments.

 

 

Locality: North Horn Mountain, Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HEC 77: Eggshell fragments.

 


Locality: Emery County, Utah.

Horizon: North Horn Formation.

Biostratigraphy:

Age: Lancian age, upper Maastrichtian Stage, uppermost Senonian subepoch, Upper Gulf Epoch, Late Cretaceous.

Material:

HEC 78 (UCMP 88127): Eggshell fragments.