The Rheraya basin has a low permeability compared with the rest of the region and consists of continental Permo Triassic sandstone formations, marly limestone continental facies of Senonian age, and multiple ferromagnesian rocky outcrops that are almost impermeable.
Most of the region is made up of Quaternary alluvium, Permo-Triassic sandstone formations, marly limestone continental facies Senonian age, with rocky outcrops to the south of the region and rugged areas to the southeast (Fig. 1c).
It is intended to be valid at a regional scale and based on two attributes: five types of lithology (volcanic, limestone, composite, continental, surficial) and a distinction between high and low islands.
Sea shells are made of aragonite, while continental limestone is mainly constituted of calcite.
Five lithological types are recognized for Pacific islands: composite, continental, limestone, reef, and volcanic.
Our sampling strategy aimed to increase the number of species of limestone Begonia of continental China not represented in previous molecular phylogenetic analyses, while maximizing representatives of all major clades in Asia (Thomas et al.2011a).2011a
Travertine is defined as a chemically precipitated continental limestone formed around seepage, springs and along streams and rivers, occasionally in lakes and consists of calcite or aragonite, of low to moderate intercrystalline porosity and often high mouldic or framework porosity within a vadose or occasionally shallow phreatic environment (Keshavarzi et al. 2011).
In more detail, the lower isotopic ratio found in samples of CL1 group (characterised by HIMT composition) shows a lower isotopic ratio, more similar to the characteristic value for continental limestone if compared to groups CL3 (Série 3.2) and CL2 (Levantine 1) [Figure 3a].
It was intentionally set at a regional scale and based on two attributes: five types of lithology (volcanic, limestone and non-volcanic sedimentary, composite and continental) and a distinction between high and low islands at elevations greater or less than 30 m above mean sea level.
The Mississippian is characterized by shallow-water limestones deposited on broad shelves occupying most continental interiors, particularly in the Northern Hemisphere.
We report here relatively modern phosphogenesis on the continental margin off South Africa, where palaeontologically old limestone (middle Eocene middle Miocene) has been phosphatized in late Pleistocene times (62 76 kyr) in an area of only moderate and seasonal present-day upwelling1,2.
