Ka timata te ngoikore o te kirihou ki te 1600ãã (871¡ãã) me te tino oti i muri i te 10 ki te 15 meneti te whakawera i te 1800ããF). Ki runga ake i tenei pāmahana, ka taea te whakatoi i te tipu witi, ahakoa ko te whakawera tino i te 1900¡ãf ka hua te ngoikore o te tipu o te witi kaore he tipu witi. Mai i te mea kaore he painga o te reeti whakamarumaru i runga i te ngoikore, ka taea e te rauemi te tarai, te hau ranei te hau.