The Argan (Argania spinosa) is a species of tree endemic to the calcareous semi-desert Sous valley of southwestern Morocco and to the Algerian region of Tindouf in the western Mediterranean region.
woodland which comprises mostly Beech, and Juniper Hill supports Ash, scrub, unimproved calcareous grassland and old quarries.
One of Crete’s rarest plants, B. kakiskalae grows on a few calcareous cliffs at 1450-1500m in the Lefka Ori (White Mountains) of western Crete.
The majority of its populations inhabit calcareous sandy grasslands from the Deliblat (Serbia: Deliblatska Peščara) throughout the Banat (Serbia, Romania) and sandy areas in Hungary along the Danube River all the way to Vienna (Austria) and South Moravia (Czech Republic).
The ground flora is indicative of the calcareous nature of the site, with Dog's Mercury (Mercurialis perennis) being locally dominant.
The northern paragneiss zone contains lenses of various lithologies, such as calcareous schists, amphibolite, eclogite, peridotite (mostly thoroughly serpentinized) and gabbro.
In the Upper Silurian series, the Leintwardine beds outcrop in the area and these consist of a calcareous sandstone which would have been suitable for making querns of a finer grade than could be obtained from Millstone grit, which was commonly used.
The land is mostly gently undulating calcareous plains with eucalypt–melaleuca–myall woodlands and chenopod shrubland interspersed with saltbush shrubland and bindii grassland.
The base is also close to the extinction level of the calcareous nanoplankton species Triquetrorhabdulus rugosus (the base of biozone CN10b) and the first appearance of nannoplankton Ceratolithus acutus.
The calcareous limestone grassland includes a range of fescue species and herbs such as Rock Rose, Thyme, Stemless Thistle, Salad Burnet and Bird's-foot Trefoil.
Prades Mountains, also known as Muntanyes de Prades, is a large calcareous mountain massif straddling the comarcas of Alt Camp, Baix Camp, Conca de Barberà, Garrigues and Priorat, in Catalonia, Spain.
The calcareous grassland is dominated by Festuca species and Dactylis glomerata, while the scrub towards the west of the site is dominated by Hawthorn (Crataegus monogyna) and Blackthorn (Prunus spinosa), while that to the east consists of Common Gorse (Ulex europaeus) and Bramble (Rubus fruticosus agg).
Because of all this, the shells resemble the calcareous tubes of certain marine worms, for example worms in the polychaete family Serpulidae.
The top of the Serravallian (the base of the Tortonian stage) is at the last common appearance of calcareous nannoplanktons Discoaster kugleri and planktonic foram Globigerinoides subquadratus.
The base of the Tortonian stage is at the last common appearance of calcareous nannoplankton Discoaster kugleri and planktonic foram Globigerinoides subquadratus.
The empty calcareous tubes of certain marine annelid tube worms, for example the Serpulidae, can sometimes be casually misidentified as empty vermetid shells, and vice versa.