stalagmites, tufa, waterfalls, calcite, moulins, caverns, crenellations, arches, icicles, umbels, rills, hummocks, massifs, slickrock, glasslike, sarcophaguses, rockwork, fingerlike, caves, palisades, cirques, colonnades, dewdrops, spiers, precipices, travertine, hoarfrost, seracs, ferny, tarns, boulders, flowerlike, protuberances, prominences, crags, stelae, limestone, grottoes, abysses, ledges, landforms, glowworm, cavelike, concretions, obelisks, semicircles, whorls, porticoes, promontories, tympanum, volcanic crater, scalelike, crystals, cumulus cloud, yellow ocher, caryatids, duckbill, frescoes, buttes, pyramids, sandstone, verdigris, hairlike, conodonts, archways, volcanic rock, striations, chambered nautilus, escarpments, toadstool, ammonites, domes, spiderwebs, metamorphic rock, crevices, ostracods, ringlet, azurite, alcoves, ashlar, glaciers, briney, wormlike, crinoids, pilasters, cenote, petals, tracery, geodes, honeycombs, gargoyles, stratovolcano, esker, octagons, terra cotta, sphagnum, nutshells, dolmen, oculus, sculptures, blobs, panicles, shards, slivers, spires, snowflakes, globes, antlers, diamonds, festoons, monoliths, needles, pinnacles, streamers, chandeliers, pearls, pendants, sapphires

carlsbad caverns, dripstone