Mysterious countersunk holes

[Andrew11]

I came across an interesting stone along a creek in Southern Oregon. The stone has 4 countersunk holes, 3 of which are intact. The holes appear to be spaced according to a pattern. There is also a beveled face that looks shaped with a tool. Has anyone encountered something similar or has a clear idea what the object was used for? Thank you.

 

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[newnan man]

Looks like you all nailed it.

 

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[smallfoot]

The last pic does look similar. Do you have a size reference? An answer on the material could also be helpful in ID. Maybe a pic of the back and the broken side. Sure, my reference was to auto parts. My eyes nor my computer can tell what material that is..it looks like many things...
Got an idea, wave a detector over it. If you are lucky and it's a fairly late model brake pad, some of those fibers you see can be copper or iron based. They've made them with lots of things over the years. Asbestos was used primarily with other additives over the years. In the late 80s-early 90s they stopped using asbestos because of health concerns. They've been made with synthetic aramid fibers mostly since however over time they have added different materials to the base material in hopes of being more efficient. Fibers like steel wool, iron fibers and others were added to both asbestos and later synthetics. Today you can find ceramic pads with copper fibers in many.

 

[Crumb]

It looks like I can see grind/polish marks on the edge were it was worked and the holes looked reed drilled best I can tell, I do believe it?s an artifact

 

[MAMucker]

The material does look to be Fibrous rather than stone.