Alvarez et al. sun ba da shawarar cewa karuwar kwatsam a cikin matakan iridium, wanda aka rubuta a duniya a cikin dutsen dutsen na zamani, ya kasance shaida kai tsaye game da tasirin. Mafi yawan shaidar yanzu ya nuna cewa wani bolide mai nisan kilomita 5 zuwa 15 (3.1 zuwa 9.3 mil) ya buga a kusa da Yucatán Peninsula (a kudu maso gabashin Mexico), ya haifar da kimanin kilomita 180 (110 mi) Chiculub Crater kuma ya haifar da babbar lalacewa. Masana kimiyya ba su da tabbacin ko dinosaur suna bunƙasa ko raguwa kafin aukuwar. Wasu masana kimiyya sun ba da shawarar cewa haɗarin meteorite ya haifar da lalacewa ta hanyar haɗarin meteorite da zafin jiki na duniya a cikin sa'o'i 66 da suka gabata. Wasu masana kimiyya sun kuma ba da shawara cewa wannan abu ne mai saurin lalacewa ta hanyar tasirin zafi na duniya maimakon aukuwar zafi mai saurin gaske daga tasirin hasken rana, yayin da wasu masana kimiyya suka ba da tabbacin cewa tasirin zai haifar da lalacewa ta hanyar hasken rana.
Yankin Yucatan