yán céng
variant of 岩層|岩层[yan2 ceng2]
rock strata
yán huà
rock painting
picture or writing carved on rocks
céng yán
stratified rock
flagstone
jiǎn xìng yán
basic rock
mafic rock (with less silicon and more magnesium, iron etc)
huī yán cán qiū
mogote (steep-sided pointed hill in karst landform)