Recently, a hidden circular structure located on the Yucatan peninsular, Mexico, with a diameter of about 180km was discovered and is considered to be an impact crater relating to the K-T event.

• 最近又在墨西哥Yucatan半岛发现了一个隐伏的环形构造,被认为是与K-T撞击事件有关的陨击坑。