太平洋西北部的御皇海山是一海底山脉,它高于海底一千多米。1975年,“挑战者”号在海深为1331米深的孝子海山(见图,308)打钻,从岩芯中发现底栖的浅水相有孔虫、介形类以及珊瑚和苔藓虫的碎片,时代为第四纪的早始新世。依据这些浅水区域的不同种类的化石,古生物学家断定,孝子海山原来显非居于现在这样深的海中,在早始新世它是接近于海 The Royal High Seas in the northwest Pacific Ocean is a sea-bottom mountain, which is more than 1,000 meters above the seabed. In 1975, Challenger was drilled in a filthy seamount of 1331 meters deep in the sea of ​​sea depths (see Figure 308). From the core, there were benthic shallow-water foraminifera, ostracods, and corals and moss Fragments of insects, the Era of Early Quaternary. Based on the different types of fossils in these shallow waters, paleontologists concluded that the filial seamount had originally lived in a sea so deep that it was close to the sea in the early Eocene