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Just as a curiosity, I thought I'd compile a list of fossil groups that are known to be so abundant in places as to be rock-forming, i.e., to form coquinas, often of a single species. I started the list but there are probably many examples I am unaware of. For example, hyoliths...? Care to add to the list? Various pelecypods (including modern/subfossil examples) Various gastropods (including modern/subfossil examples) Some rugose, tabulate, and scleractinian corals (including modern/subfossil examples) Some crinoids (as encrinite) Some ophiuroids (but really just thin beds?) Some ammonoids? Some belemnoids? Some orthocerids etc. (mostly early Paleozoic) Some nautiloids (Alaska Devonian example) Some lingulate brachiopods (mostly Cambrian) Some strophomenide and orthide brachiopods (mostly early Paleozoic) Some pentameride brachiopods? Some tentaculitids (e.g., Arkona) Some hyolithids? Some trilobites (mostly Cambrian) Some trepostome bryozoans Various sponges, notably stromatoporoids and chaetetids Some algae such as Tasmanites, diatoms (as diatomite), coccolithophores (as chalk), red algae (as rhodolite), etc. Some radiolarians Various plants in coal swamps (as coal) Microbes such as cyanobacteria (as microbialite, laminite, stromatolite, thrombolite, oncolite, etc.) Any others?
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From the album: Complete thin section images
bioclastic grainstone- Bioclasts: Gastropoda, Orbitolina, Bivalve, ...