The study of these trackways is called ichnology, and there are nine different trackways from three locations in Ireland that are all older than the oldest tetrapod body fossils we've found.

对这些足迹的研究称为生态学，爱尔兰三个地点有九种不同的足迹， 它们都比我们发现的最古老的四足动物身体化石还要古老。