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2. Travertine - Wikipedia

   en.wikipedia.org/wiki/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 ...

3. Shelly limestone - Wikipedia

   en.wikipedia.org/wiki/Shelly_limestone

   Brachiopods and bryozoans in an Ordovician shelly limestone, southern Minnesota Shelly limestone from Suzac France. Shelly limestone is a highly fossiliferous limestone, composed of a number of fossilized organisms such as brachiopods, bryozoans, crinoids, sponges, corals and mollusks.

4. Tufa - Wikipedia

   en.wikipedia.org/wiki/Tufa

   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.

5. Pavers (flooring) - Wikipedia

   en.wikipedia.org/wiki/Pavers_(flooring)

   Stone pavers are made of many materials including limestone, bluestone, basalt (such as that from The Palisades used in New York City), sandstone and granite. [19] Travertine is a durable, low-porous stone that stays cool in direct sunlight, making it a popular choice for pool-sides, patios, walkways and outdoor entertainment areas.

6. List of rock textures - Wikipedia

   en.wikipedia.org/wiki/List_of_rock_textures

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7. Archaeologists Find a 2,500-Year-Old Shipwreck in the ...

   www.aol.com/archaeologists-2-500-old-shipwreck...

   Underwater archaeologists dug under 20 feet of sand and rock off the coast of Sicily and found a 2,500-year-old shipwreck. Researchers date the find to either the fifth or sixth century B.C.