On Tuesday, October 20, the Museum will close at 3 pm, and the Hall of Ocean Life will be closed all day.
Part of Hall of Planet Earth.
AMNH/R.Mickens
With burial and the associated increase in pressure and heating, shales may be transformed by re-crystallization in the deep crust into metamorphic rock, like this gneiss. Even greater heating of shales may lead to melting and generation of new granite magma.
AMNH Collection