A name made up by someone who doesn't understand chemical nomenclature nearly as well as they think they do. Most likely they were trying to come up with a fancy word for "water".
"Hydrogenous" is just silly; beyond the problem of making the root of hydrogen "hydrogen-" rather than the more proper hydr- (cf "hydride"), it implies that hydrogen has at least two common positive oxidation states, of which +1 is the lower. This is, of course, nonsense, since hydrogen has one proton and +1 is therefore the highest (and only) possible positive oxidation state.
It's just barely possible that they thought the existence of hydrogen peroxide (empirical formula: HO) implied that hydrogen might have a +2 oxidation state. This is still wrong, though, it's just wrong in a different way.
hydrogenous sediment
No. It is a type of Hydrogenous sediment.
salt precipitating out of the seawater
Minerals that crystallize directly from seawater are examples of hydrogenous sediment.
Copper (I) Oxide or Cuprous Oxide
Calcium oxide.
Hydrogenous sediments are formed when minerals precipitate from the ocean, or they can be formed when minerals in the water react with older sediments.
Calcareous ooze
not a hydrogenous sediment?
Are Hydrogenous sediments
The three types of ocean floor sediments are Terrigenous, Biogenous, and Hydrogenous sediments.
Along which coast is Thorium found in abundance?
It's material found in bottom sediment or in the water column of a body of water that was precipitated out of stuff in the water, ie. hydrogenous material does not come from a terrestrial, cosmic or biological source.
hydrogenous sediment
No. It is a type of Hydrogenous sediment.
minerals that crystalize directly from ocean waters
salt precipitating out of the seawater