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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.
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)
Pages in category "Limestone formations" The following 200 pages are in this category, out of approximately 374 total. This list may not reflect recent changes .
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.
The fossils at Riversleigh are unusual because they are found in soft freshwater limestone which has not been compacted. [2] This means the animal remains retain their three-dimensional structure, rather than being partially crushed like in most fossil sites. The area is located within the catchment of the Gregory River. [3]
The tectonics processes in Indonesia formed major structures in Indonesia. The most prominent fault in the west of Indonesia is the Semangko Fault or the Great Sumatran Fault, a dextral strike-slip fault along Sumatra Island (about 1,900 km). The formation of this fault zone is related to the subduction zone in the west of Sumatra.
The Anoual Formation is a geological formation in the High Atlas of Morocco.It is early Bathonian in age. It consists of two members. The lower member is several hundred metres thick, and consists largely of mudstone with lens beds of cross bedded sandstone, with thin intercalations of limestone that was deposited in a freshwater continental setting, likely lacustrine or palustrine, with small ...
In the lime industry, limestone is a general term for rocks that contain 80% or more of calcium or magnesium carbonate, including marble, chalk, oolite, and marl.Further classification is done by composition as high calcium, argillaceous (clayey), silicious, conglomerate, magnesian, dolomite, and other limestones. [5]