側そく堆たい石せき

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Meanings

1

noun

lateral moraine

geology

Technical term in geology for a ridge of debris deposited along the side of a glacier.

side, lean, oppose

堆piled high

石stone

堆たい石せき
堆石 is a general term for moraine; 側堆石 specifically refers to the lateral type.
終しゅう堆たい石せき
終堆石 is a terminal moraine, formed at the glacier's snout, while 側堆石 forms along its sides.

Compound of 側 (side) and 堆石 (moraine). The exact historical derivation is uncertain, but the term is a direct calque from Western geology.