Re: Rock with wet clay inside
I been waiting for someone that might be more familiar with your Columbus Ohio area to chime in, but such is not the case. So I�ll take a (WAG) wild ass guess at it. What you are looking at is two different questions, how long has the water and mud been in your rock and how it got in there in the first place.
(1) A lot depends on the type of material your rock is made up of, some kind of soft material your mud could be fairly recent water and silt seeping into your rock. Where as harder material such as agate your mud could be quite a bit older forming when the agate was formed.
(2) Second question how did the water and silt get in your rock to start with? You mentioned in your post that �They were digging up dirt to prepare a foundation for a new house�. This is how a crack or hole may have let water and silt into a vug (a cavity) in your rock.
Hope this is of some help.
From Bob Place - February 09, 2013 at 00:02:23