The Hart museum will remain closed until further notice. The County approved a motion to begin negotiations to transfer ownership of William S. Hart Park and Museum to the City of Santa Clarita. Learn more.

At Arm's Length

Understand deep time by plotting out the history of Earth along your arms!

Illustration of a figure spreading their arms outwards

To explore more about Deep Time and support the incredible research and education NHMLAC offers, visit Dinosaur Ball 2023.