Discussions on Geologic time period

Also, the integer type doesn't have enough precision to record some of the periods e.g. Late Jurrasic 161.2 ± 4.0 to 145.5 ± 4.0 million years ago,

We should use the same pattern for uncertainty that we used on Atomic mass.

Thanks for fixing this up. I typed a bunch more topics with the newly revamped type, but many of them still need their dates filled in.

I spent a bunch of time poking around Wikipedia, trying to see if there was an easy way to extract the dates from the infoboxes, but the date range information is tucked away somewhere not easily extractable, alas.