Editing Northumbrian rocks and landscape: a field guide
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'''lag '''An accumulation of coarse '''''clastic '''''or '''''bioclastic '''''material, usually in the floor of a channel. | '''lag '''An accumulation of coarse '''''clastic '''''or '''''bioclastic '''''material, usually in the floor of a channel. | ||
− | '''limonite '''A general term for unspecified hydrous earthy iron oxides usually derived from the weathering of iron minerals in rocks or | + | '''limonite '''A general term for unspecified hydrous earthy iron oxides usually derived from the weathering of iron minerals in rocks or '''veins'''. |
'''linguoid '''Tongue-shaped (of asymmetrical ripples). | '''linguoid '''Tongue-shaped (of asymmetrical ripples). | ||
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'''magma '''A hot, liquid or semi-liquid melt within the Earth's crust; the source for all '''''igneous '''''rocks and processes. | '''magma '''A hot, liquid or semi-liquid melt within the Earth's crust; the source for all '''''igneous '''''rocks and processes. | ||
− | '''marcasite '''FeS<sub>2</sub> Pale brass-yellow or greyish metallic mineral, common as bladed or laminated crystalline masses in Pennine | + | '''marcasite '''FeS<sub>2</sub> Pale brass-yellow or greyish metallic mineral, common as bladed or laminated crystalline masses in Pennine '''veins'''. |
'''marl '''A calcareous clay with 35–65% soft calcium carbonate. | '''marl '''A calcareous clay with 35–65% soft calcium carbonate. |