Artifacts or Fossils??

[2goldennuggets]

I originaly posted this question in the fossil area, heres a link.

Are they fossils or artifacts. Note the ridge around the base that goes all the way around both these.

http://forum.treasurenet.com/index.php/topic,259084.0/topicseen.html

 

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[The Grim Reaper]

Natural stones. I have a few that look just like those. Those are formed by the softer upper rock eroding and the harder base remaining. I even have a couple that have the harder stone on both top and bottom and they look like cookies.