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Title: Graywacke, New York State
Caption: Graywacke (or greywacke) is an old term describing a dark colored gritty sandstone, usually cemented with abundant clay minerals and silica. Graywacke is characterized by a range in constituent grain sizes, but invariably set into a hard, compact matrix. Many graywackes are associated with old formations that have been deeply buried.
Credit: Album / Science Source / JOEL AREM
Image size: 3774 × 2550 px | 27.5 MB
Print size: 32.0 × 21.6 cm | 1485.8 × 1003.9 in (300 dpi)