7. Recrystallization: The original skeletal material has grown into new crystals. The process may be aragonite crystallizing to calcite, as in fossil snails, or it may be the growth of larger crystals ...

Two underwater sea lilies were eaten and regurgitated around 66 million years ago. They were preserved as fossilized vomit.

Fossil calcite, Earth’s molecular time capsule, may send faint tales from long-gone life for researchers to better understand ...

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 ...

Fossil echinoderms are numerous, due in part to the fantastic preservation potential of the calcite plates that form their skeletons. They have been found in Phanerozoic marine sediments around the ...

This is composed of a polycrystalline calcite and has a smooth ... It is therefore possible to use tubercle structure and distribution to be more precise about how fossil heart urchins used their ...