noun
rock painting; cave painting; pictograph
Refers to paintings on rock surfaces, especially ancient cave paintings or pictographs. Often used in archaeological or art history contexts.
この地域の岩壁画は約1万年前のものだ。
The rock paintings in this area are about 10,000 years old.
洞窟の中に美しい岩壁画が残っている。
Beautiful cave paintings remain inside the cave.
洞窟壁画 explicitly means 'cave painting', whereas 岩壁画 can include both cave and open-air rock paintings.
Compound of 岩 (rock) + 壁画 (wall painting). The exact historical derivation is uncertain, but the term is a modern coinage for archaeological and art historical contexts.