同学你好，该知识点来自沪江网校《大学水平直达CATTI二级（笔译+口译）【三年畅学开学季专享班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好
查了一下原文：Thousands of tons were extracted before 1875, when it was first noticed that the tar contained fossil remains. Major excavations were undertaken that established the significance of this remarkable site. The tar pits were found to contain the remains of scores of species of animals from the last 30,000 years of the Ice Age.
单看这一句话这样翻译是对的，结合上下文来看的话，译为“大规模的发掘奠定了该遗址的重要地位”更准确。site应该是指代发现的化石遗迹。
希望对同学有帮助~