Unusual rocks?

[crossfire631]

Found these years ago out hunting. Thought they were unusual looking so kept them but no idea what they are. Any thoughts?

 

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[jewelerguy]

top three pic look like petrified wood. not sure about the last one

 

[Back-of-the-boat]

Top three definitely look like petrified wood and the other looks like some type of sandstone with shells (fossils) in it ?

 

[ToddsPoint]

Top 3 look like coral to me. Bottom one looks like limestone. Gary