GC4D4VN Medina Lagoon (Earthcache) in Andalusia, Spain created by yiklo61

GC4D4VN Medina Lagoon (Earthcache) in Andalusia, Spain created by yiklo61

GC4D4VN Medina Lagoon (Earthcache) in Andalusia, Spain created by yiklo61

• Geology

a) Geological context
The morphology of this area forms a very soft relief, mainly due to the soft nature of its main components. The levels of gypsum and salts included in the Triassic series are affected by processes of karstification and dissolution.

b) Lithology
The Laguna de Medina sits on a very varied representation of deposits. The oldest materials that appear in the environment of this wetland and that constitute, to a large extent, its substrate are constituted by a set of multicolored clays, fine-grained sandstones usually micaceous, with light tones, both primary and diagenetic plasters , of sacaroid aspect, of white, pink and gray tones, and dolomitic and dolomitic limestones, stratified in thin levels sandwiched between clay and sandstone, in benches of 20-30 cm, all associated with Triassic. In the eastern sector we can see an alternation of marl, limestone and / or limestone-marly, distributed in centimetric to decimetric banks, with white and pink tones assigned to the Upper Cretaceous-Eocene. In the western sector of this lagoon, and above the levels previously described, are a set of dark green clays, marls, limestones and calcarenites of the turbidítico type, dated as the Eocene-Oligocene, that act as a surface of takeoff tectonic region. Finally, it should be noted that in the northern sector of this lagoon there is a set of sands with intercalations of levels of gravel and some clays, corresponding to a level of high terrace of the Guadalete River. consisting of white marls with radiolaria and diatoms denominated in this region as "moronitas" or "albarizas", dating to the Middle Miocene.

• Hydrology
From the hydrogeological point of view, these wetlands do not maintain an important hydrogeological relationship with aquifers containing groundwater. Both the Laguna de Medina and the Salada are located on a set of clays, marls, very fine-grained sandstones and gypsum, allotted to the Triassic, Upper Cretaceous, Paleogene and Neogene, all of them considered as low permeability.

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The Laguna de Medina is the largest in the province of Cadiz and the second in Andalusia, behind Fuente de Piedra. It is located ten kilometers from Jerez de la Frontera, in an environment of gentle cultivated hills whose slopes direct the rainwater towards the lagoon. The other main contribution comes from Arroyo Fuente Bermeja. The soils of plaster, clays and marls that surround the lagoon are responsible for the salinity of its waters. This wetland has a semipermanent character reaching two meters in the deepest areas and completely drying out in the summer in the least rainy years.

As you can see walking along its path, surrounding the lagoon develops a belt of vegetation with carrizos, eneas, tarajes and castanets that constitute a privileged habitat for birds in danger of extinction. This is the case of malvasia and the horned coot, which have motivated its international recognition with various protection figures. Along the way, it is also easy to find other birds that are frequent at different times of the year, from teal, goose, red ducks and ducks to flamingos.

Moving away from the wetland, the dominant vegetation is the Mediterranean scrubland, well preserved in some spots, with olive trees, lentisco, palmito and jaras. Then there is the rural landscape of typical cortijos, between crops of cereal and sunflower mainly. This use is limited, along with others, to protect its natural wealth, its main value as a reserve. Other patrimonial values ​​are the old defensive constructions that still stand next to the motorway, by which we can arrive at the near Monastery Cartujo de Jerez, authentic Renaissance jewel.