[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Extinction and other...
> ah but don't look at humans, WE didn't survive the KT....our ancestor
> million years ago did. WE are derived.
Ah, but I didn't. I was using 'we' in the very inclusive, "all hairy
sense. There was no way for you to know that, unless you had picked up
a book to
see if Cretaceous mammals had pineal foramina in their skulls. They
Mammals proper, including those that survived the KT boundary, all have
pineal glands roofed over by skull and brains. The last thing in our
had a pineal foramen was a Permian or Triassic synapsid. And neither
crocs have pineal foramina, so the pineal gland as an evolutionarily
structure seems to be doing fine without a window of its own.
> Unless the earth's been knocked off it's orbit to screw up the
> and out of normal rotation to screw up day/night, these periods would
> not have changed.
An "asteroid winter" would, by definition, screw up the seasons. And my
that if the light only varied from near dusk to pitch black, that might
enough light to keep circadian rhythms from running smoothly. This is
speculation, and I freely admit that I may be mistaken. But in terms of
foramina, dinos, mammals, birds, and crocs are all lacking (the foramen,
gland), so I see no correlation between the gland and KT extinctions.