abysm

Bergson fears that the temporal series will be swallowed up in the "dark backward and abysm of time," or rather of eternity.

The novelists indeed can show that the beginning of their history is lost in the abysm of time.

Phil and I had been classmates in the dark backward and abysm, and we were still, in a manner of speaking, friends.

I shall never count an iota against you "in the dark backward and abysm of Time."