There are rock formations which border Huascaran National Park. The oldest deposits date back to the Jurassic period, three of which cover most of the park. We can find sedimentary, volcanic, magnetic and intrusive rock among the formations.
Sedimentary Rock
* Upper Jurassic: Outcrops are found predominantly in the central area, especially lutites with alternating sandstone layers.
* Lower Cretaceous: Limonites, lutites with alternating sandstone layers are found in the southern and central-southern areas of the HNP.
-In the southern area of the HNP, the bottom part of rock formations is composed of sandstone and quartzites with argillite layers, in some cases with the presence of anthracite. The upper part is composed of solid quartzites and thin layers of argillites.
-Rock formations southeast to the HNP are composed of limestone and calcareous clay
-Rock formations in the southeastern area of the HNP have sandstone layers and thin quartzites with alternating argillite layers
-The southern area of HNP is composed of solid limestones
-The southeastern area of the HNP consists of marga, a rock composed mainly from lime carbonate and clay, with alternating limestone and calcareous argillite layers.
Igneus rocks
The outcrops of this group are found in the southern area of the HNP and are composed of two units. The lower group is composed of piroplastic toba; a light, porous stone formed from lime found in water. The upper group is composed of coal briquets, gaps and lava.
Batholiths
The Cordillera Blanca batholiths are the most predominant intrusive unit in the HNP and is composed of coarse-grained granodiorite.
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