Noun
becoming inflexible or out of date
the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone
Source: WordNetPollen in the fossil record main Pollen's sporopollenin outer sheath affords it some resistance to the rigours of the fossilisation process that destroy weaker objects; it is also produced in huge quantities. Source: Internet
While it has long been debated whether the gap is a result of fossilisation or relates to an actual event, recent work indicates the gap period saw a drop in atmospheric oxygen levels, indicating some sort of ecological collapse. Source: Internet