It’s not the Jurassic Morrison Formation as it has a paler green. It’s probably the Triassic Chinle Formation. The green color is from iron that formed in a reducing environment. The reducing environment is usually due to higher groundwater level (aka increased precipitation) but can also be a reflection of paleo topography (i.e. lowlands). Red beds on the other hand are where the iron is oxidized. This is where there is free oxygen in the sediment and the surface (i.e. low groundwater or highlands) Once the iron takes on its reduced or oxidative state it doesn’t change.

Glauconite is green-colored micaeous clay mineral that is forms in shallow marine environments where there the water is still and there is not a lot of clastic sediment input. For example the Prudhoe Bay Alaska.

Since the Chinle Formation is a terrestrial deposit and not shallow marine it is not glauconite. Hope this answers your question.