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19. This site might provide some answers.

Sat Apr 12, 2014, 05:59 AM

Apr 2014

http://jan.ucc.nau.edu/~rcb7/

Most of these concentrations occurred during what we call the carboniferous period. Much of the earth's landmass and shallow seas were concentrated around the equator. These conditions favored the development of massive swampy regions full of plant and animal life.

http://science.nationalgeographic.com/science/prehistoric-world/carboniferous/

http://palaeos.com/paleozoic/carboniferous/carboniferous.htm

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Highlight:

The Earth Shook for a Half Hour [View all] PADemD Apr 2014 OP

Heavy Stuff, Sir The Magistrate Apr 2014 #1

It's Ma'am PADemD Apr 2014 #2

And on a long enough timeline, it'll happen again. AtheistCrusader Apr 2014 #3

I've often wondered why all the fossil fuels are so concentrated dickthegrouch Apr 2014 #4

This site might provide some answers. Enthusiast Apr 2014 #19

sooner or later MrNJ Apr 2014 #5

I wonder if this caused the tilt in the axis. Spitfire of ATJ Apr 2014 #7

self delete Codeine Apr 2014 #12

It wasn't a Nazi thing. Spitfire of ATJ Apr 2014 #14

Craters on Moon from same Late Heavy Bombardment period. ErikJ Apr 2014 #8

I love this vid on it.... Spitfire of ATJ Apr 2014 #13

Fascinating lark Apr 2014 #9

Cool stuff greytdemocrat Apr 2014 #10

L! H! B! MisterP Apr 2014 #11

"The Earth Shook For A Half Hour" Motown_Johnny Apr 2014 #15

ROFL!!!!!!! calimary Apr 2014 #18

Norm Sleep is a pretty cool name. cyberswede Apr 2014 #16