The middle portion of the Molasse is of marine origin, and is shown by its fossils to be of the age of the Faluns; but the lower and upper portions of the formation are mainly or entirely of fresh-water origin.
Lithologically, the series consists principally of sands and clays, with beds of lignite and coal, and its organic remains show that it is principally of fresh-water origin with a partial intermixture of marine beds.
Strata of Deep-sea and Shallow-water Origin alternate.
The absence of many fossil forms usually met with in marine strata, affords a useful negative indication of the fresh-water origin of a formation.
Yet we recognise their fresh-water origin, because they are of the same genera as those now abounding in ponds, lakes, and rivers, either in our own country or in warmer latitudes.
Since these latter strata are mostly of comparatively shallow sea-water origin, as proved by coarseness of grain of material, ripple marks, fossil coral reefs, etc.
We conclude, therefore, that the Appalachian strata are of marine, shallow-water origin.
The Tertiary and Quaternary formations are partly of marine and partly of terrestrial and fresh-water origin.
But since the necessary conditions for the formation of ripple-mark occur most abundantly in shallow water, its frequent appearance in a series of strata may often be taken as evidence, so far, for the shallow-water origin of the beds.
The Cretaceous strata are almost wholly marine, and chiefly of deep-water origin.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "water origin" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
