Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Abubuwan da ke dauke da burbushin burbushin halittu na Burgess Shale suna da alaƙa da Stephen Formation, tarin ƙananan duwatsu masu duhu, kimanin shekaru miliyan 508. An ajiye gadaje a gindin dutsen mai tsawon mita 160, a ƙarƙashin zurfin da raƙuman ruwa suka girgiza a lokacin hadari. Wannan dutsen da ke tsaye ya ƙunshi ƙwayoyin calcareous na Cathedral Formation, wanda wataƙila ya samo asali ne jim kaɗan kafin ajiyar Burgess Shale. Ba a san takamaiman tsarin samarwa da tabbaci ba, amma mafi yawan yarda da ra'ayi ya nuna cewa gefen Cathedral Formation reef ya zama ya rabu da sauran reef, ya ragu kuma an dauke shi nesa - watakila kilomita - daga gefen reef. Daga baya sake kunnawa na kurakurai a gindin tsarin ya haifar da rushewar sa daga kimanin shekaru miliyan 509 da suka gabata. Wannan zai bar wani dutse mai zurfi, wanda za a kare shi daga tectonic decompression saboda dutsen dutse na Cathedral Formation yana da wuyar matsawa. Wannan kariya ta bayyana dalilin da yasa burbushin da aka adana daga Cathedral Formation ba zai yiwu a yi aiki tare da <unk> tectonic matsawa na gadaje ya haifar da tsagewa a tsaye wanda ya karya duwatsu, don haka suka rabu a tsaye ga burbushin. Ginin Walcott ya samar da burbushin halittu masu ban mamaki saboda yana kusa da Stephen Formation <unk> hakika yanzu an haƙa dutsen har zuwa gefen dutsen Cambrian. Da farko an yi tunanin cewa an ajiye Burgess Shale a cikin yanayin anoxic, amma bincike mai yawa ya nuna cewa oxygen yana ci gaba da kasancewa a cikin tarkace. An yi la'akari da cewa yanayin da ba shi da kyau ba kawai ya kare kwayoyin da suka mutu daga lalacewa ba, amma kuma ya haifar da yanayin sunadarai wanda ya ba da damar adana sassan sassan kwayoyin. Bugu da ƙari, ya rage yawan kwayoyin halittar burrowing <unk> ana samun burrows da hanyoyi a cikin gadaje masu dauke da kwayoyin halittar jiki, amma suna da wuya kuma gabaɗaya suna da iyakantaccen tsayi. Saline seep ne wani madadin...  Tambaya: A ina ne ake samun burbushin?
tushe na wani dutse