stratum; geological layer; bed
Refers to a layer of rock, soil, or sediment in the earth's crust. Used in geology, archaeology, and civil engineering.
この崖にはいくつもの地層が見える。
Several strata are visible in this cliff.
You can clearly see the layers of strata stacked on top of each other in this cliff.
地層の年代を調べるためにボーリング調査が行われた。
Boring surveys were conducted to determine the age of the geological layers.
The researchers closely examined the strata in this area.
Ancient fossils were found in this stratum.
The strata are exposed due to erosion by the river.
地層 refers to a layer of rock or sediment, while 断層 refers to a fault—a fracture where rock layers have shifted—so the two are easily confused in geology contexts.
地層 names a specific layer or stratum of rock/soil, whereas 地質 describes the general geological character of an area.
stratigraphy
geological disposal; deep geological disposal
deep geological disposal (of radioactive waste)
Compound of 地 (chi, 'earth, ground') and 層 (sō, 'layer, stratum').