noun[mass noun] Geology
Material which accumulates at the foot of a steep slope.
- In the southern part of the valley, the Serghaya Fault Zone follows the mountain front juxtaposing recent alluvium and colluvium against late Quaternary lake sediments, Neogene conglomerates, and Cretaceous carbonates.
- Deposits formed on hill slopes are called colluvium where they are fine-grained, and taluvium if they are of coarse-grained rock debris.
- Archaeologists can use the evidence of pollen, alluvium (flood-deposits), and colluvium (hill-wash) to study the past environment.
- Example sentences
- A few hundred metres to the east, the trachy-phonolitic breccias, debris flows, colluvial and alluvial deposits of Agulo record the volcanic activity and the erosion of the east flanks of the Vallehermoso stratovolcano.
- Allochthonous sediments enter the cave system through a number of processes, including aeolian, fluvial, colluvial, biogenic, glacial, marine, and human activity.
- In addition, secondary topaz crystals, released from matrix by erosional forces, have been found in both alluvial and colluvial sediments adjacent to topaz-bearing pegmatites.
Mid 20th century: from Latin colluvies 'confluence of matter', from colluere 'to rinse', from col- 'together' + luere 'to wash'.
For editors and proofreaders
Line breaks: col|lu¦vium
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