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对北大西洋深海钻探计划(DSDP)548号孔的浮游有孔虫组合,及晚上新世底栖有孔虫氧同位素的详细分析表明:北半球冰期是通过一系列冷暖循环逐渐开始的.这个结果与其它地点(DSDP)的研究相抵触.后者表明在2.4~2.5Ma间,冰期以跳跃方式突然发生.在此以前,古气候状况一直是稳定的,两者的区别可以用取样亲间距与沉积间断来解释.由于沉积间断,其它位置上晚上新世冰期开始时间变得模糊不清,看起来,像是以跳跃式开始的.548号孔研究表明:北半球冰川作用之发端,与其说在地质历史上是一个突发古气候事件,不如说是气候逐步恶化的结果.
A detailed analysis of the planktonic foraminiferal assemblages in Hole No. 548 in the North Atlantic Deep Sea Drilling Program (DSDP) and the late Oxygen Beacon’s Oxygen Isotopes shows that the Northern Hemisphere glacial phase started gradually through a series of warm and cold cycles, Other locations (DSDP) contradict the study, which indicates that a glacial jump occurred abruptly between 2.4 and 2.5 Ma, and paleoclimatic conditions have been stable until now, with the difference being between sampled pro-space and sediment Intermittent to explain due to sedimentary discontinuities, other places on the night before the onset of the New-Pleistocene ice age becomes blurred, it seems, like a hop-like hole No. 548 research shows that: the origin of the northern hemisphere glacier effect, not so much in the geological History is a sudden episode of paleoclimate, as it is the result of gradual deterioration of the climate.