<prompt> Translate the following text to EnglishMiamba ya kale zaidi ni miamba ya mchanga yenye umri wa miaka milioni 500 iliyopatikana karibu na kilele cha kaskazini cha Skiddaw, ambapo milima ina miundo laini na ya mviringo.  <response>: The oldest rocks are 500 million-year-old slates found around the northern peak of Skiddaw, where the mountains have smooth and rounded profiles. 