Toadstools were created by two types of rocks with contrasting erosional characteristics. The toadstools in the Rimrocks and wahweap Creek are made of the Entrada Sandstone Formation. White pedestals are made of fine-grains massive sandstone while the capstones or topknots are either made of reddich conglomerate or gray weather-resistant sandstone.
In the case of the Wahweap Creek toadstools, when it rains and the pedestal becomes wet, gravity pulls the column down, literally melting away. They were once much taller than they are today.
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