The upper, near-horizontal layers deposited on a Gilbert-type delta, generally characterized by the coarsest sediment found on the prograding (see progradation) delta. See also foreset; toeset.
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。