The water depth had increased since Late Te r tiary and reached to high stand in Early and Middle Pliocene (outer neritic to b athyal environment), and then decreased.

• 研究认为崖19-1-1井晚第三纪以来古水深变化的总趋势为逐渐增大，至上新世早中期出现外浅海至半深海环境，为古水深最大时期，随后水深则逐渐减小。