Dacite

Rock type: 
Igneous
Age: 
66 millions years
Tags: 
Dacite, oligoclase, orthoclase, sanidin, biotite, Cretaceous, Paleocene, Maastrichtian, Danian, quartz
Submitted 4 years 7 months ago by rock.

Gray dacites. Forms an extensive cover. Phenocrysts: oligoclase, orthoclase, sanidin, quartz, biotite. Phenocrystal sizes: 0.1 - 2 mm, rarely 3-4 mm. Upper Cretaceous - Low Paleocen. Thickness: 500-600 metres.

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