<prompt> I-Ordovician iphawula inkathi yokugcina yokuhlukahluka okukhulu phakathi kwama-trilobites: zimbalwa kakhulu izindlela ezintsha ngokuphelele zenhlangano ezivela ngemuva kwe-Ordovician.  <response>: Yiqiniso, inguqulo eyinkimbinkimbi yomusho ithi I-Ordovician iphawula inkathi yokugcina yokuhlukahluka okukhulu phakathi kwama-trilobites, amaphethini ambalwa kakhulu omhlangano omusha avela ngemuva kwe-Ordovician; ukuguqulwa kamuva kwama-trilobites kwakuyindaba yokuguquguquka kwezindikimba ze-Ordovician. 