Search results
Results from the WOW.Com Content Network
Fossiliferous limestone is a type of limestone that contains noticeable quantities of fossils or fossil traces. If a particular type of fossil dominates, a more specialized term can be used as in "Crinoidal", "Coralline", "Conchoidal" limestone. If seashells, shell fragments, and shell sand form a significant part of the rock, a term "shell ...
Shelly limestone is a highly fossiliferous limestone, composed of a number of fossilized organisms such as brachiopods, bryozoans, crinoids, sponges, corals and mollusks. It varies in color, texture and hardness. Coquina is a poorly indurated form of shelly limestone. Shelly limestone is a sedimentary rock because it is made up of fragments.
Carboniferous Limestone – Limestone deposited during the Dinantian Epoch of the Carboniferous Period; Coquina – Sedimentary rock that is composed mostly of fragments of shells; Coral rag – Limestone composed of ancient coral reef material; Chalk – Soft carbonate rock; Fossiliferous limestone – Limestone containing fossils
Limestone (calcium carbonate CaCO 3) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of CaCO 3. Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can take place ...
A well-cemented coquina is classified as a biosparite (fossiliferous limestone) according to the Folk classification of sedimentary rocks. [6] Coquinas accumulate in high-energy marine and lacustrine environments where currents and waves result in the vigorous winnowing, abrasion, fracturing, and sorting of the shells that compose them.
Fossil crinoids in polished Frosterley Marble. Frosterley Marble is a black, bituminous coraliferous limestone containing fossil crinoids of the Lower Carboniferous (Mississippian ), some 325 million years ago. [1] [2]: 40 It outcrops in Weardale, County Durham, England, including near the village of Frosterley whence it is named.
It has been less used in modern times, but a remarkable example is the church at Kingston, Purbeck, Dorset built in 1874–1880. [8] Other strata of Purbeck Limestone are being quarried at the present time (2021). Purbeck Marble was previously extracted in 1993. [9] Purbeck Marble is used by a number of contemporary sculptors, such as Emily ...
Richard III's tomb, of Swaledale white limestone on a Kilkenny black marble plinth. Kilkenny marble or Kilkenny black marble is a fine-grained very dark grey carboniferous limestone found around County Kilkenny in Ireland in the "Butlersgrove Formation", a Lower Carboniferous limestone that contains fossils of brachiopods, gastropods, crinoids and corals. [1]