from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plural form of greensand.
Sorry, no etymologies found.
As a result of multiple sea-level changes between the last 135 to 5 million years before present, the Atlantic Coastal Plain became overlain with layers of unconsolidated, permeable silts, sands, clays, greensands, and marls.
They do not occur in the oldest sedimentary rocks, but as we ascend to the more recent geological epochs, they increase in abundance, until, in the greensands and other recent formations, whole beds of coprolites and other organic remains are met with.