DEEP TIME was originally published as an accordion-fold comic glued into a circular shape, so the story could be read backwards and forwards from any starting panel. Physical editions of DEEP TIME printed in bright red and teal risograph are avaliable in my shop.
every single animal in this comic is extinct. it's not too late for the ones that are left.
edit: thanks @mudcrabmassacre for the correction, smilodon fatalis did not in fact go extinct in 1023 AD. the actual prediction is around 10,000 years ago - I think i may have missed a zero or two.