Krucze Skały (Raven Rock) GEOSITE

Title: Krucze Skały (Raven Rock) GEOSITE
Description: A rock group composed of typical Karkonosze granites (Karkonosze pluton), gray and grey-pink in color, with a chaotic rock background texture and a large variation in the size of mineral grains. The lower part of the rocks is made of light, even-grained granite, while the top is made of porphyry granite. In granites, especially porphyry varieties, wavy biotite streaks appear. Next to the szlires, there are numerous, spherical or oval enclaves with a dark color. Aplitic veins are visible in the lower parts. Throughout the entire rock group, a characteristic system of cracks with a NNW-SSE direction is visible.
Geosite element: Karkonosze Granite; Fracture system NNW-SSE
Lithology: granite
Geologic structure type: Fracture
Related to event: Karkonosze intrusive event
Event environment: crustal setting
Event process: intrusion
Older named age: Carboniferous
Numeric age: 312 My
Interest: Petrographic
StructuralRegion: Western Sudetes