Paleontologists at Mammoth Cave National Park have unearthed an ancient shark species previously unknown to science.

An ongoing Paleontological Resource Inventory discovered the new species, called Clavusodens mcginnisi, while collecting ...

A. Apatite (calcium triphosphate): This mineral makes up the bones and teeth of vertebrates and the shells of inarticulate brachiopods. Calcium phosphate looks chalky when new, but can darken to black ...

Bryozoans and brachiopods, nearly equal in abundance, form about 60% of the allochems in local limestone. Crinoids form about 20% and trilobitesnearly 10% of the allochems. According to detailed ...

These included brachiopods, which lived in shells resembling those of clams or cockles, and animals with jointed, external skeletons known as arthropods—the ancestors of insects, spiders ...