Calcareous (/kælˈkɛəriəs/) is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky. The...

The calcareous sponges (class Calcarea) are members of the animal phylum Porifera, the cellular sponges. They are characterized by spicules made of calcium...

Calcareous grassland (or alkaline grassland) is an ecosystem associated with thin basic soil, such as that on chalk and limestone downland. Plants on calcareous...

Calcareous nannofossils are a class of tiny (less than 30 microns in diameter) microfossils that are similar to coccoliths deposited by the modern-day...

A calcareous glade is a type of ecological community that is found in the central Eastern United States. Calcareous glades occur where bedrock such as...

J.J. Amann – Arizona calcareous moss Mnium blyttii Bruch & Schimp. – Blytt's calcareous moss Mnium hornum Hedw. – horn calcareous moss Mnium jungermannia...

Calcareous dinoflagellate cysts or calcareous dinocysts are dinoflagellate cysts produced by a group of peridinoid dinoflagellates, called calcareous...

Limestone Alps (German: Nördliche Kalkalpen), also called the Northern Calcareous Alps, are the ranges of the Eastern Alps north of the Central Eastern...

Sud-orientali, German: Südliche Kalkalpen), also called the Southern Calcareous Alps, are the ranges of the Eastern Alps south of the Central Eastern...

The dinaric calcareous silver fir forests are an endemic vegetation type of the littoral Dinaric Alps, located in the Dinaric Mountains mixed forests ecoregion...

gypsum – see the variety called "onyx-marble", actually a travertine Calcareous sinter – A freshwater calcium carbonate deposit Calthemite – Secondary...

The Limestone Alps (German: Kalkalpen) are sub-mountain range of the Alps in Central Europe. They are of economic importance, including as a watershed...

Calcareous sinter is a freshwater calcium carbonate deposit, also known as calc-sinter. Deposits are characterised by low porosity and well-developed lamination...

Lime is an inorganic material composed primarily of calcium oxides and hydroxides. It is also the name for calcium oxide which occurs as a product of coal-seam...

Raphidonema is an extinct genus of calcareous sponges. This genus is known in the fossil records from the Cretaceous period of France and United Kingdom...

not be confused with hot spring (thermogene) travertine. Tufa, which is calcareous, should also not be confused with tuff, a porous volcanic rock with a...

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of...

ooze are siliceous, which is composed primarily of silica (SiO2), and calcareous or carbonate, which is mostly calcium carbonate (CaCO3). In an area in...

The Southern Ridge and Valley / Cumberland dry calcareous forest is a forest system found in Alabama, Georgia, Tennessee, Kentucky, Virginia, and West...

Arturia canariensis, commonly known as the yellow calcareous sponge, is a species of sponge in the family Clathrinidae. It is found in shallow seas in...

The Calcareous Grit is a geologic formation in England. It preserves fossils dating back to the Jurassic period. Earth sciences portal England portal Paleontology...

Serpula vermicularis, known by common names including the calcareous tubeworm, fan worm, plume worm or red tube worm, is a species of segmented marine...

Mnium stellare, the starry thyme-moss or stellar calcareous moss, is a moss species in the genus Mnium. Edwards, Sean R. (2012). English Names for British...

water loss than a thin mucus epiphragm would be. This very sturdy flat calcareous structure has a small perforation to allow for oxygen exchange. Helix...

described. Barnacle adults are sessile; most are suspension feeders with hard calcareous shells, but the Rhizocephala are specialized parasites of other crustaceans...

and the construction of the metazoan body plan. Sponge spicules can be calcareous or siliceous. Siliceous spicules are sometimes embedded in spongin. Spicules...

from land. These particles consist primarily of either the microscopic, calcareous or siliceous shells of phytoplankton or zooplankton; clay-size siliciclastic...

This is usually made of a horn-like material, but in some molluscs it is calcareous. In the land slugs, the shell is reduced or absent, and the body is streamlined...

rather than calcareous) in the oceans occurred during the Cretaceous; freshwater diatoms did not appear until the Miocene. Calcareous nannoplankton...

the Entre-Deux-Mers region of Bordeaux. Brickearth – See under Loess. Calcareous soil – Alkaline soil with high levels of calcium and magnesium carbonate...