Drilled Slate Modern or No?

[jeramme]

Hi all, hoping for your opinion on this piece I found along the river. It looks to be slate and is drilled...the drilling seems to be to perfect to me to be ancient, but looking for your thoughts and opinions. Thanks for your consideration

 

[robertk]

Definitely modern. I never heard of an ancient hole being countersunk.

 

[DizzyDigger]

Definitely modern, as you can still see the scoring marks from the countersink bit.

There was a second hole, as well, and the rock broke off at that point.

Could have been decorative slate mounted to a wall?

 

[newnan man]

Maybe roofing slate.

 

[Treasure_Hunter]

It looks like the old roofing slate and holes made by modern drill....

 

[jeramme]

Thought so..thank you! Appreciate your insight.

 

[ToddsPoint]

It’s counter bored, not countersunk. I’ve never seen Indians do that either.

 

[CreekSide]

Cool find, I agree with a slate roof tile

 

[southfork]

Definitely modern. I never heard of an ancient hole being countersunk.

They may not have what we call countersink but, A lot of pieces are conically drilled looks like a countersink.

 

[robertk]

It’s counter bored, not countersunk. I’ve never seen Indians do that either.

Correct. I didn't know there were two different terms for it until your post. (Today, I have learned....).

 

[Assembler]

Correct. I didn't know there were two different terms for it until your post. (Today, I have learned....).

A counterbore is a cylindrical hole that produces a flat bottom, while a countersink is a conical hole that matches the shape of a flathead screw. Both are used to allow the head of a screw or bolt to sit flush with the surface of a material.