It seems I am a big Dennis Taylor fan, In less then a week after devouring the first two books in the series I polished off the third: All These Worlds
With no more bobiverse books until October I listened to the first of his new series: Outland
Outland is set in the present when there is an eruption of a super volcano under Yellowstone national park.
Our heroes have invented a portal to a multiverse, where there are alternative versions of Earth. The Earth they flee too is one where man is not present.
So mega fauna is still present such as sabre tooth tigers, mammoths, and giant sloths.