Neil Gaiman's 1602 introduced a whole host of new storytelling grist for the figurative mill from which Marvel's writers and artists can draw upon: classic characters, re-envisioned through a filter of having originally been intended for the 'sandbox' backdrop of the year 1602.
And although that alone is incredible, in and of itself, it is not what I wish to focus on today.
If I might be given leave to do so, I'd like to preface the following statements by admitting that the pragmatic fanboy in me (now there's two words I never thought I'd see used together) well realizes that the actual rationale behind the following phenomenon was to facilitate Gaiman's literary 'shout-out' to Jack Kirby, by way of Devil Dinosaur (in lieu of the Mole Man's monster).
One of the more curious aspects of the hypothesized alternate history given by 1602 is the continued existence (albeit in greatly-diminished numbers) of prehistoric animals - dinosaurs in particular. It is presented as a universally-accepted fact - common knowledge amongst society at large, and not at all thought of as being in the least bit strange...
So how are there still dinosaurs - and why? Gaiman makes nary an attempt at offering up an explanation... but really, isn't it obvious?
They're there simply because dinosaurs are cool - and that (and, by extension, Gaiman) rocks.