Comments on: Arizona Geologic History: Chapter 1, Precambrian Time When Arizona was at the South Pole

By: bob

bob — Fri, 12 Mar 2010 17:08:47 +0000

heeeeeeeey=)

dsst civil war — Sat, 21 Nov 2009 13:23:22 +0000

Thought I would spend time to read and comment on most of your articles today as the weather is so shocking

judaica art — Thu, 05 Nov 2009 18:15:45 +0000

Super – Duper site! I am loving it!! Will come back again – taking you feeds also, Thanks.

xxxxxx — Wed, 28 Oct 2009 04:55:52 +0000

Your blog is so informative

Peramarie — Wed, 21 Oct 2009 16:17:55 +0000

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ldonyo — Mon, 31 Aug 2009 15:21:30 +0000

As always, interesting stuff, Jonathan! I have a question, too. Is there a Cambrian period to go with the Precambrian one?