These old tacky nail looking things?

[jml818]

I was detecting around some old stone walls back in woods today and came across some glass & pottery pieces. As seen I found couple intact bottles.
In all my years of detecting I have never dug these type of wide head nails or tacks?
What was their special purpose?
I'm guessing 1890's era?

 

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[4x4x4]

....Not unlike roofing paper nails ?

 

[relic lover]

Might be upholstery tacks

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[pat-tekker-cat]

Horse shoe nails?

 

[Bamadad53]

They look like fasteners for asbestos singles.

 

[ivan salis]

old wood shingle roof tacks

 

[NOLA_Ken]

I'd say old roofing nails as well. They aren't asbestos shingle pins, those are shorter and don't have points

 

[old digger]

Definitely looks like tar-paper roofing nails.

 

[DownNDirty]

Don't know what the specific purpose was but those are blacksmith-forged square-shanked nails. 1700s or earlier. I have found a few just like them at 18th century sites.