Over millions of years the sediments were compressed, by their own weight, into sedimentary rocks, e.g. sandstone, limestone etc.
oʊ v ə ɹ WORD_BOUNDARY m ɪ l iə n z WORD_BOUNDARY ʌ v WORD_BOUNDARY j ɪ ɹ z WORD_BOUNDARY ð ə WORD_BOUNDARY s ɛ d ɪ m ə n t s WORD_BOUNDARY w ɜː WORD_BOUNDARY k ə m p ɹ ɛ s t WORD_BOUNDARY b aɪ WORD_BOUNDARY ð ɛ ɹ WORD_BOUNDARY oʊ n WORD_BOUNDARY w eɪ t WORD_BOUNDARY ɪ n t ʊ WORD_BOUNDARY s ɛ d ɪ m ɛ n t ə ɹ ɹ i WORD_BOUNDARY ɹ ɑ k s WORD_BOUNDARY iː WORD_BOUNDARY d̠ʒ iː WORD_BOUNDARY s æ n d s t oʊ n WORD_BOUNDARY l aɪ m s t oʊ n WORD_BOUNDARY ɛ t s ɛ t ɹ ə WORD_BOUNDARY