Help identifying rock

[Tcar]

Can anyone tell me what kind of rocks these are ? Or what they were maybe used for or why there chiseled ? Any help would be appreciated !

 

[Chilli]

Can anyone tell me what kind of rocks these are ? Or what they were maybe used for or why there chiseled ? Any help would be appreciated ! View attachment 2243927View attachment 2243928View attachment 2243926

The second one looks interesting. Is that a shell of something in it, maybe tube worm casing/shell?

 

[Tcar]

? I have no idea it’s like a tube in a rock but it seems to be rock also? But it’s carved out all around it to expose it and whoever quit before they got it out . It’s definitely in the rock and carved all around it ??

 

[Tcar]

The first pic someone carved a hole chasing whatever the orangish yellow stuff is ?

 

[opalboy]

Fossil coral?

 

[Tcar]

I have no idea ! I only know that someone chiseled all around it for some reason and left that in there for some reason