知識貝殼
知識貝殼
Definition: Rock material formed from consolidated mud or sediment that filled a holloworganic structure,such as a fossil shell. The fossil formed after dissolution of the mold.內(nèi)核nèihé指生物遺體中空部分的充填物,如雙殼類和腕足類常形成內(nèi)核化石,其表面為外殼的內(nèi)模 ......（本文共 365 字 ） [閱讀本文] >>