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Geotope · Porto de Mós · 398 m

Algar Chão Castelo

Name: Algar Chão Castelo
Address: Portugal

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Município de Porto de Mós

In the civil parish of Alqueidão da Serra, located between Barrenta and Covas Altas, the Chão Castelo Pothole is included in the geomorphological unit of the São Mamede plateau. Structurally, it is an extended diaclase (rock fracture), reaching a depth of -13 m. In its genesis, it is formed by the corrosion of water that seeps through the surface of the karst massif. According to the Geological Chart of Portugal, it develops in the Aire Mountain Range Micritic Limestone formation dating from the Bathonian (Middle Jurassic, around 180 million years ago).

The pothole is a karst cavity of the vadose shaft type (Baroñ, 2003), whose genesis is due to the water that seeps deep into the epicarst and, being sufficiently acidic, causes the limestone to corrode, widening the fractures in the massif and forming the wells. With a narrow entrance, the first well, at -9 m deep, leads to a chamber 6 m long and 1.5 m wide, with a ramp of loose stones that fill the entire base of the well. At the southern end of the chamber, a short horizontal passage leads to a second and third wells of 2 m each, which allows us to reach the deepest part of the cavity, at -13 m. The pothole has no relevant speleogenetic formations.

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Município de Porto de Mós

Coordinates

39.586203, -8.751152

DMS

39°35'10.3"N 8°45'04.1"W

UTM

29S 521369 4381861

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