<prompt> Translate the following text to EnglishMwamba huo ulioko kwenye miamba ya chokaa uliokuwa umefichwa katika msitu wa mto huo uligunduliwa mwaka 1878 na kikundi cha wavumbuzi, kutia ndani mtaalamu wa asili Mmarekani William Hornaday.  <response>: Set in limestone cliffs hidden in the jungle, they were discovered in 1878 by a group of explorers, including the American naturalist William Hornaday. 