flagstones

Well, unless they spelt themselves differently, they weren't there in 1901. The only rural Conaghers are in Ballyshiel, Co. Down. It's not close enough to the border that you'd mistake it for Antrim.

There's no end of McKinleys, mind you.

derangedlemur Another version of this photograph gives "Conagher's farm, Co. Antrim Home of the McKinley's". Did they just rent from Conagher? There's a Conagher Bridge in Dervock...

There's several Ulster buildings of american significance preserved at Cultra but not this one. www.nmni.com/uafp/Collections/Buildings/Ulster-Buildings

There is an exterior in the archive, described as Conagher's Farm, Giant's Causeway, Co. Antrim

Are those roofing slates in the foreground?

Yes, they're probably Liscannor Stone which is quarried in the surrounding area. This was shipped by the quarries from Liscannor pier which is how the stone got the name.

Liscannor Stone was most famous as flooring and paving. Killaloe slate was used for roofing. The streets of London were paved with Liscannor Stone. Also on very low tide you can see the hull of a ship laden with similar slabs half buried in the sand.

Liscannor stone was used for roofing some buildings around the area, there is one building in Lahinch which still has the big stones on the roof - the Cetlic T-shirt Shop.

The building with the sign on the right is a Smithy according to the Os 25 " map.