Science. 1990 May 18;248(4957):843-7. doi: 10.1126/science.248.4957.843.
Trace element, isotopic, and mineralogic studies indicate that the proposed impact at the Cretaceous-Tertiary (K-T) boundary occurred in an ocean basin, although a minor component of continental material is required. The size and abundance of shocked minerals and the restricted geographic occurrence of the ejecta layer and impact-wave deposits suggest an impact between the Americas. Coarse boundary sediments at sites 151 and 153 in the Colombian Basin and 5- to 450-meter-thick boundary sediments in Cuba may be deposits of a giant wave produced by a nearby oceanic impact. On the southern peninsula of Haiti, a approximately 50-centimeter-thick ejecta layer occurs at the K-T boundary. This ejecta layer is approximately 25 times as thick as that at any known K-T site and suggests an impact site within approximately 1000 kilometers. Seismic reflection profiles suggest that a buried approximately 300-km-diameter candidate structure occurs in the Colombian Basin.
微量元素、同位素和矿物学研究表明，提议的白垩纪-第三纪（K-T）边界撞击发生在一个海洋盆地中，尽管需要少量的大陆物质。受冲击矿物的大小和丰度以及喷发层和冲击波沉积物的有限地理分布表明，撞击发生在美洲之间。哥伦比亚盆地的站点 151 和 153 以及古巴的 5 至 450 米厚的边界沉积物中的粗边界沉积物可能是附近海洋撞击产生的巨浪的沉积物。在海地的南部半岛，K-T 边界处有一层大约 50 厘米厚的喷发物。这个喷发物层的厚度大约是任何已知的 K-T 地点的 25 倍，表明撞击点在大约 1000 公里范围内。地震反射剖面表明，哥伦比亚盆地中存在一个埋藏的直径约 300 公里的候选结构。
