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Title: argillite
Caption: Surface fracture pattern of thinly laminated argillite, a hardened siltstone or shale made of clay, silt, and incompletely oxidized ferrous oxide minerals, found along the Hidden Lake trail in Glacier National Park.
Category: nature • Geology & Fossils
Credit: Album / Science Source / Gregory G. Dimijian, M.D.
Image size: 4096 × 2723 px | 31.9 MB
Print size: 34.7 × 23.1 cm | 1612.6 × 1072.0 in (300 dpi)