The excavations formed by deposit feeders in search of food. The category includes radial traces (see trace fossil), e.g. Chondrites, and U-shaped tubes, e.g. Rhizocorallium.
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。