Glaciers and permafrost can preserve an entire organism. Only very young - Pleistocene - fossils are preserved this way. 7. Recrystallization: The original skeletal material has grown into new ...

Commonly, fossil shells made of aragonite will recrystallize into a more stable form of the same compound called calcite. Recrystallization preserves the shape of the original fossil, though sometimes ...

Focus: investigating the timing of biomineral switches in Late Cretaceous bryozoans and their relationship to changing seawater chemistry Museum scientists are investigating the timing of a switch ...