Molting tree?

It would appear that the real­ly big sycamore in our back yard is molt­ing? Um. Help?

Our yard with tree bark all over

Our yard with tree bark all over

This is one piece of bark

This is one piece of bark

UPDATE: I’ve been informed by peo­ple more knowl­edge­able than I that sycamore trees do this on a reg­u­lar basis. In fact, since this event, we’ve had sev­er­al more bark­falls, prob­a­bly exac­er­bat­ed by the drought this sum­mer.