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Alan Hildebrand who was based in Calgary in western Canada, was determined to be the one to discover the crater.
Alan Hildebrand一直在加拿大西部的卡爾加里從事研究，他一心想找到這個隕石坑。
He knew the spherule layers should be thicker, the nearer he got to the crater itself...
他知道，越接近隕石坑，小球體層就應該越厚，
so he followed the trail of the spherules.
于是，他開始追尋小球體的蹤跡。
Here in western Canada we have a layer at the Cretaceous-Tertiary boundary,
在加拿大西部的這個地方，我們找到了處于白堊紀的第三紀界線層，
it's about one centimetre thick on average.
它平均有1厘米厚。
In Colorado and New Mexico it's two or two and a half centimetres thick.
但在美國的科羅拉多和新墨西哥，它的厚度有2-2.5厘米。
Still further south in the Caribbean as in Haiti it's about a half metre thick
往南直到加勒比海的海底，厚度又達到了半米左右，
so by nineteen eighty nine we knew that the source crater had to be somewhere between North and South America.
所以在1989年，我們推測隕石坑一定就在北美洲和南美洲之間的某個地方。
Then Alan Hildebrand had a stroke of luck.
不久，Alan Hildebrand的好運來了。
He happened to be looking at an old oil company map,
他無意中看到了一幅石油公司的老地圖，
he was looking at the Yucatan Peninsula in Mexico, near a village called Chicxulub, then he noticed something odd.
他在研究墨西哥的尤卡坦半島時，在一個叫做希克蘇魯伯的小村莊附近他注意到了一些奇怪的東西。
This is when I spotted: a horseshoe shape feature, we can see it better on this map.
我發現的就是這個：一個馬蹄鐵形的地貌，用這張地圖可以更清楚地看到它。
The anomaly is a hundred and eighty kilometres across
這個特別的地方有180公里寬，
which was in the range of sizes predicted for this crater
這正好符合對隕石坑大小的推測，
and laying on the Yucatan Peninsula, between North and South America,
它位于尤卡坦半島上，在南北美洲之間，
it's within the region where the ejecta thickness says the crater should lie.
這個地區的火山噴出物也表明了隕石坑的存在。
So this suggested that this might indeed be the crater that killed the dinosaurs.
這些都說明它極有可能就是導致恐龍滅絕的那個隕石坑。
