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PSt10 - Ilhéu da Cal

Ilhéu da Cal  ©Virgílio Gomes

Geosite ID: PSt10

Name: Ilhéu da Cal

Thematic category: Paleontology

Geographical location on orthophotomap  - PSt10

Municipality: Porto Santo

Civil parish: Porto Santo

Location area: 10-1000 ha

Coordinates(1):33°00'09.02'' N 16°23'16.97'' W

Altitude: 0 m

Accessibility: Easy

Distance to nearest paved road: 6,4 nmi

Conditions of observation: Satisfactory

(1) Coordinates of the geosite and / or the best viewpoint


Brief description

In Ilhéu da Cal, also known as Ilhéu de Baixo, it is possible to observe hyaloclastites, layers of carbonated pararecifal deposits and conglomerates, submarine basaltic flows and basaltic tuffs from the middle Miocene. The top of this islet is covered by Quaternary aeolianitic deposits. Like the other islets, it was once connected to the main island and its individualization resulted from erosive processes that occurred after the last glaciation and the deposition of the aeolianitic formation during the Holocene, less than 10-12 thousand years ago. Several galleries were drilled in the calcareous deposits that formed two continuous layers throughout the islet. This material was used in the lime manufacturing industry, an activity that was extremely important to the local economy. These deposits correspond to carbonated sedimentary marine deposits and fossilized coral reefs, with 15.2 My (middle Miocene), that formed on the top of the volcanic edifice during Porto Santo’s pre-emergence phase.


Relevant notes

The visitation to the islanders requires prior authorization from the Institute of Forests and Nature Conservation (IFCN).
Visiting a site of geological interest is the sole responsibility of the user.
The user must take precautions when visiting the site, taking into account the conditions of the terrain, weather conditions and other hazards, so that they do not create situations that put themselves or others at risk.
The user must respect private property. Access to private areas requires prior authorization from the owners.
The user must respect natural heritage, keeping it intact. The impact of your actions should be minimal.


How to Cite

FERREIRA, M. R. (2014). Património Geológico da Ilha do Porto Santo e Ilhéus Adjacentes (Madeira): Inventariação, Avaliação e Valorização como Contributo para a Geoconservação. Dissertação de Mestrado em Vulcanologia e Riscos Geológicos. Departamento de Geociências da Universidade dos Açores. In:

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