Holotype: SMA 0087 ("Chris")

Locality: Howe Scott Quarry, Big Horn County, Wyoming.

Horizon: Member?, Lower Morrison Formation.

Biostratigraphy: Zone?

Age: Comobluffian age, Kimmeridgian Stage, uppermost Malm Epoch, Late Jurassic.

Material: Articulated specimen.

Referred specimen?

SMA 0084 ("Rich"): Articulated specimen.