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The Green River Formation is an example of a prominent freshwater sedimentary formation containing numerous limestone beds. [70] Freshwater limestone is typically micritic. Fossils of charophyte (stonewort), a form of freshwater green algae, are characteristic of these environments, where the charophytes produce and trap carbonates. [71]
Purbeck Marble – Fossiliferous limestone found in the Isle of Purbeck, Dorset, England (not a "true marble"; fossiliferous limestone) Sussex Marble – Limestone Pages displaying wikidata descriptions as a fallback Pages displaying short descriptions with no spaces (not a "true marble"; fossiliferous freshwater limestone)
Tufa columns at Mono Lake, California. Tufa is a variety of limestone formed when carbonate minerals precipitate out of water in unheated rivers or lakes. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits, which are known as travertine or thermogene travertine.
Travertine terraces at Mammoth Hot Springs, Yellowstone National Park, in 2016 Calcium-carbonate-encrusted, growing moss in a low-temperature freshwater travertine formation (1 euro coin for scale) Travertine (/ ˈ t r æ v ər t iː n / TRAV-ər-teen) [1] is a form of terrestrial limestone deposited around mineral springs, especially hot ...
The Upper Floridan aquifer contains freshwater over much of its extent, though is brackish and saline south of Lake Okeechobee. [2] The Floridan aquifer system crops out in central and southern Georgia where the limestone, and its weathered byproducts, are present at land surface.
The Sacred Cenote at Chichen Itza, Mexico. Cenotes are surface connections to subterranean water bodies. [5] While the best-known cenotes are large open-water pools measuring tens of meters in diameter, such as those at Chichen Itza in Mexico, the greatest number of cenotes are smaller sheltered sites and do not necessarily have any surface exposed water.
Both subunits primarily consist of mudstone and sandstone, but near the base of the upper unit there is a 20-30 metre thick succession of limestone deposited in a freshwater setting. [ 1 ] Stratigraphy
East Kirkton Quarry, or simply East Kirkton, is a former limestone quarry in West Lothian, Scotland, now a renowned fossil site.The quarry is known for terrestrial and freshwater fossils about 335 million years old, from the late Viséan stage of the Mississippian subperiod (Early Carboniferous Period).