a cryptocrystalline type of radiolarite; (more generally) = radiolarite, n.
| 单词 | θ5627 |
| 释义 | the world > the earth > structure of the earth > constituent materials > rock > sedimentary rock > [noun] > other siliceous (3) radiolarian chert1890 a cryptocrystalline type of radiolarite; (more generally) = radiolarite, n. silcrete1902 A quartzite formed of sand grains or pebbles cemented together by silica; a siliceous duricrust. radiolarite1910 A type of hard, homogeneous, fine-grained siliceous sedimentary rock formed mainly from the skeletal remains of radiolarians. Also: any sedimentary… |
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