A naturally occurring object that may resemble a fossil. If there is uncertainty the object may be referred to the Problematica; it is called a pseudofossil when the resemblance results purely from chance.
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。