[2] The age of the formation is dated between approximately 90.9 to 88.6 million years ago based on detrital zircons.

The shales are brownish gray in color, and the sandstones are discontinuous beds of very pale orange to light brown poorly sorted grains that usually show steep crossbedding.

It represents beds southwest of the pinchout of the Pescado Tongue where the Tres Hermanos Formation and Gallup Sandstone are no longer lithologically distinguishable.

[4] It also documents a time of tectonic upheaval, volcanic activities, humid paleoclimate, and North American coastal margin shifts.

[1] Moreno Hill Formation was originally thought to be devoid of fossils,[3] but it has since yielded a diverse vertebrate paleofauna, including four genera of dinosaurs.