A microscopic fossil, as of a pollen grain or unicellular organism.
A microscopic fossil, as of a pollen grain or unicellular organism.
微体化石一种微小的化石，如花粉粒或单细胞有机体的化石
A microscopic fossil, as of a pollen grain or unicellular organism.
微体化石一种微小的化石，如花粉粒或单细胞有机体的化石