fossils in the andes of huancayo, peru

adpression altitude america andean andes aragonite authigenic background biosignature calcareous calcite casts dna ecosystem environment evolution exoskeletons fossilis fossilization fossils geological geology high highlands holiday huancayo imprint landscape mineralization molds nature nobody paleontology permineralization peru petrified plant record recrystallization remnants road rock sierra soil south stone strata texture trace trip