新墨西哥州一个7400万年的星骨 可能属于一个早期的T. Rex祖先 将北美巨型特兰诺索人的起源推回原位 A 74-million-year-old shinbone in New Mexico may belong to an early T. rex ancestor, pushing back the origin of giant tyrannosaurs in North America.

在新墨西哥州发现的74百万年前的双腿骨可能属于Tyrannosaurus rex的早期祖先, A 74-million-year-old shinbone found in New Mexico may belong to an early ancestor of Tyrannosaurus rex, suggesting giant tyrannosaurs evolved in southern Laramidia much earlier than thought. 来自Kirtland Formation的化石表明,一个重约4,700公斤的大型高原动物,尽管由于遗骸有限,其确切分类仍然不确定。 The fossil, from the Kirtland Formation, indicates a large theropod weighing about 4,700 kg—largest known for its time—though its exact classification remains uncertain due to limited remains. 来自火山灰层的精确数据支持这个观点,即大型强脊椎动物起源于北美洲而不是亚洲。 Precise dating from volcanic ash layers supports the idea that large tyrannosaurids originated in North America, not Asia. 科学家们说,这些发现对先前的时间表提出了挑战,并呼吁开展更多的研究,包括进一步挖掘和分析博物馆收藏品。 Scientists say the discovery challenges previous timelines and calls for more research, including further excavations and analysis of museum collections.