A discordant relationship at the lower boundary of a depositional sequence where younger, initially inclined strata thin out down-dip across an underlying inclined or horizontal surface. Compare onlap. See also baselap; seismic stratigraphy.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。