Subcategories:
— [noun] (31)
— [adjective] (48)
— [adverb] (4)
— [verb (transitive)] (1)
— sedimentary formation (198)
— thin layer (16)
— vein (15)
— fold or dip (87)
— discontinuity or unconformity (154)
— volcanic formations (50)
— deposited by water, ice, or wind (47)
— formations by contents (42)
— mass (27)
— rock formations (77)
— boulder, pebble, or stone formation (19)
— mark on feature or surface (15)