Cap de Creus is made mainly of Palaeozoic schists, crossed by pale pegmatite veins. According to the park, they were deformed about 300 million years ago, at over 650 ºC and between 10 and 20 km deep, and its north coast has some of the most spectacular shear zones in the world.
The rocks of Cap de Creus are among the oldest in Catalonia. They began as mud, sand and limestone laid down in the Palaeozoic and, according to the natural park, about 300 million years ago they lay between 10 and 20 km deep, at over 650 ºC, bending as if they were soft. That is where the dark schists, the white pegmatite veins and that melted-looking coast come from.
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A piece of the backbone of the Pyrenees
The park's geology page places the cape within the axial zone of the Pyrenees, along with the Canigó, the Pica d'Estats, the Val d'Aran and the Cerdanya: the strip of the oldest rocks, from the primary or Palaeozoic era, that forms the backbone of the range.
The park tells the story in stages. In the Palaeozoic, which it dates between 650 and 250 million years ago, the cape's oldest materials were laid down: pelites, sandstones and limestones. In the Hercynian orogeny, between 300 and 280 million years ago, came folding, the first phases of metamorphism, which turned those sediments into schists, gneisses and marbles, and the granodiorite intrusions of Roses.
Later, in the Alpine orogeny, the one that raised the Pyrenees, the whole area was deformed into a dome and folded a second time. In the Cenozoic the faults bounding the Empordà opened and magma rose: the basalts of Puig Ferral and Cap Norfeu date from the same period as the volcanoes of the Garrotxa. Since then, water and wind have done the work.
Schists, pegmatites and company
Metamorphic rocks are the most abundant: mainly schists and phyllites, with marbles, calc-silicate rocks, quartzites, amphibolites and gneisses. Among the igneous rocks are the Roses granodiorites and the basalts, and in the northern part of the cape, among the schists, there are pegmatite dykes and small bodies of granitoids and diorites.
The park's Special Plan, approved by the Generalitat in 2006, sums up the contrast you see at a glance: dark crystalline schists intruded by white masses of pegmatite, which add to the picturesque look of the landscape and sharpen differential erosion.
Pegmatites are made of large crystals and, according to the park, wear away more slowly. That is why they stand out. Water, wind and salt gradually break the rock down until holes open up, called alveoli, and what is left standing are the shapes everyone tries to recognise.
The shear zones, which is what visitors from abroad come to see
A shear zone is a band where rock was deformed by sliding, like stretched dough, and the rock that comes out of it, ground fine and layered, is called mylonite. According to the Special Plan, the north coast of the cape offers one of the most spectacular areas in the world of shear zones and mylonitic rocks in schist, and the mylonites in the granodiorites of Roses and Rodes are also exceptional.
They even show on the map. The park explains that in the northern sector the streams follow the north-west to south-east line of the shear zones, and that the small valley of the Rec de s'Arenassa is carved along a mylonitic band.
The photo in this guide shows it on a small scale: according to its author on Wikimedia Commons, it is a pegmatite dyke near Cala Prona offset by 23 metres along one of these shear zones.
Why it is a site of geological interest
The same Special Plan explains why the cape is a case apart: it has one of the most complete series in Catalonia of lower Palaeozoic rocks, with every grade of regional metamorphism and facies not known elsewhere; examples of minor folds and superimposed folds that it considers unique on a world scale; and the most complete collection of metamorphic rocks in Catalonia.
That is why the plan requires the authorities to protect the inventoried points of geological interest inside the park and asks the park's managers to draw up a catalogue of geotopes and geozones. The Gran Enciclopèdia Catalana puts it this way: the deformation structures exposed here form a unique set and one of the richest in the world, a reference for studying deformation, metamorphism and magmatism.
Where to see it on foot without being a geologist
The tip of the cape is an Integral Nature Reserve, the highest level of protection, precisely because of its geological, botanical and landscape value, and you may only walk on the signposted routes: the old path from Cadaqués to the lighthouse, the GR 11, the Tudela route and the Punta de Cap de Creus route. The park's leaflet is clear: here the oldest rocks in Catalonia come to the surface, dark schists interrupted by pale, sometimes reddish, pegmatite veins, which in places form whimsically folded sheets or veins.
The Tudela route is the easiest: a 4 km loop with 110 m of climbing, starting from the Coll de Ses Portes. It passes Es Camell, the largest pegmatite dyke on the cape, which erosion has left looking like a camel lying down and gazing at the sea, and s'Àliga, another pegmatite shaped like an eagle with outstretched wings, and ends at Culip cove.
From the coast you can see two islands that are pure geology. The island of s'Encalladora, also called Mariblanca or Illa Blanca, is made of schists and pegmatite veins, is 600 metres long, the longest in Catalonia according to the park, and lies about 100 metres offshore. The island of Massa d'Or, or Sa Rata, is schist except for the head and tail, which are pegmatite; the park notes that the name may come from the mica, which shines like gold in the morning sun.
At the lighthouse, the Espai Cap de Creus is an information point and small museum in high season. The rules apply to stones too: you may not collect rocks or minerals, and the park asks visitors not to stack stones.
Checked
Information checked in October 2026 with: Cap de Creus Natural Park (hydrology and geology page, «Top 10 del parc», leaflet for the Punta de Cap de Creus and Tudela routes and the Tudela route sheet), the Special Plan for the Protection of the Natural Environment and Landscape of the Cap de Creus Natural Park (Generalitat de Catalunya, August 2006), the Gran Enciclopèdia Catalana (natural park entry) and Wikimedia Commons (photo description).
Quick questions
What kind of rocks are there at Cap de Creus?
Mainly Palaeozoic metamorphic rocks: schists and phyllites, with marbles, quartzites, amphibolites and gneisses. Among the northern schists there are pegmatite dykes, and at Roses, granodiorites.
What are the animal shapes in the rocks at Tudela?
They are pegmatite dykes, made of large crystals that wear away more slowly, left standing by water, wind and salt. Es Camell is the largest pegmatite dyke on the cape.
Where can you see the geology of Cap de Creus on foot?
On the signposted routes of the Integral Nature Reserve at the tip: the old path from Cadaqués to the lighthouse, the GR 11, the Tudela route and the Punta de Cap de Creus route. In the reserve you may only walk on these.