Fossiliferous limestone is a type of sedimentary rock characterized by a significant presence of fossils, typically derived from marine organisms. It forms primarily from the accumulation of calcium carbonate (CaCO₃), predominantly in the mineral form of calcite.

Feb 15, 2021 · Lime mud is sediment composed of calcium carbonate (CaCO 3) derived from the skeletal remains of shelled organisms, coral, and calcareous algae and plankton. Large amounts of lime mud is created by waves battering reefs and reef organisms (including dead corals and other calcareous skeletal material) being chewed up and excreted by reef-living ...

Origin of Lime Mud: Decay of calcareous Algae • Modern aragonite muds (< 10 µm) produced by the post-mortem disintegration of calcareous green algae (e.g., Halimeda & Penicillus)

Micrite is a limestone constituent formed of calcareous particles ranging in diameter up to four μm formed by the recrystallization of lime mud. [1] [2] The term was coined in 1959 by Robert Folk for his carbonate rock classification system. [2] Micrite is derived from MICRocrystalline calcITE.

On the basis of these criteria, the following four classes were defined: a mud-supported carbonate rock containing <10% grains. a mud-supported carbonate lithology containing >10% grains. a grain-supported fabric containing 1% or more mud-grade fraction. a grain-supported carbonate rock with <1% mud.

May 7, 2021 · Various mechanisms (biotic versus abiotic) have been proposed for the formation of lime mud in Earth’s history. However, the detailed role that microbes play in the nucleation and subsequent precipitation of micrites remains to be resolved.

Most of the dark fossils are brachiopods in various states of preservation. The pair of light gray fossils that taper to one end are snail fossils cut through the middle by erosion. This bioclastic limestone preserves the remains of the world's first attempts at reefs.

Fossils are rare in this facies but include ostracods, stromatolitic algal structures, rare solitary corals, crinoid plates and spiriferid brachio-pods. Only the ostracods and algal structures actually occur in the lime mudstone. Other elements are in coarse-grained crinoidal or locally oolitic limestone beds or breccia blocks within the lime ...

Apr 25, 2018 · These carbonate buildups are rich in (now lithified) lime mud, contain a shelly marine fossil fauna and generally lack any sign of a rigid supporting framework. Complex cavity systems...

Our preliminary data suggest that the El Rosario fossil deposit is a combined result of anoxic bottom conditions, early diagenetic phosphatization, and rapid burial in a soft, micritic lime mud.