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>The Mesozoic Era, which is what is relevant to dinosaurs,
>consists of the Triassic, Jurassic, and Cretaceous Periods,
>in that order.
The mnemonic I use is if I hop into a time machine, I will encounter
each of the three periods in alphabetical order.
>In the seas there were plesiosaurs (long necked sea beasts),
>ichthyosaurs (the reptilian equivalent of dolphins),
But _were_ they reptiles? I suspect not, that body plan is built for
a powerful swimmer. If they weren't out-and-out warm-blooded, I suspect
they were at least as much so as modern tuna.