Geosite ID: M01PSL03
Name: Dunas da Prainha
Thematic category: Sedimentology and Paleontology
Civil parish: Caniçal
Location area: 0,1 - 10 ha
Coordinates(1):32°44'42.6'' N 16°42'56.3'' W
Altitude: 60 m
Distance to nearest paved road: 1 m
Conditions of observation: Good
(1) Coordinates of the geosite and / or the best viewpoint
The Dunas da Prainha form a coverage of aeolian sands that ranges from the Middle Pleistocene (200 to 300 thousand years) to the Holocene (8500 to 4500 years B.C.). The sand is composed of bioclasts (shells, calcareous algae, urchin spicules, foraminifera carapace), mineroclasts (rolled olivine and pyroxene grains) and lithoclast (basaltic rock fragments). Despite its marine origins, the deposition and accumulation process is subaerial, as shown by the deposit structure and significant presence of terrestrial gastropod fossils (Pulmonata), whose species were described by Wollaston (1878) and Silva (1957), as well as bird’s bones and eggshells.
In the aeolian deposits it is possible to observe (very fragile) rootcasts as well as pedogenic carbonate horizons (2 facies, one solid and another one powdery).
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