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I remember, as a child, digging down in the sand in Skerries (perhaps 65 years ago). Obviously not digging far, but hitting a layer of black stuff. My parents told me it was oil. It had a very particular smell. I still remember it. I still wonder what it was. It happened more than once.

The answer, according to A.I.:

The Science Behind the 'Black Oil' Layer

The Lack of Oxygen (Anoxia): On popular beaches like Skerries South Beach or North Strand, the top few inches of sand are constantly turned over by waves and the tide, keeping them well-oxygenated and clean. However, just a short distance below the surface, the tightly packed sand particles block fresh water and oxygen from penetrating.

Decaying Organic Matter: Over time, bits of seaweed, marine organisms, and organic silt get buried under the shifting sand. In an environment devoid of oxygen, normal decomposition cannot happen. Instead, specialized anaerobic bacteria take over to break down this organic material.

The Chemical Reaction: These bacteria "breathe" sulfates (which are abundant in seawater) and exude iron sulfides. It is this iron sulfide that dyes the sand grains a deep, jet-black color and gives it a slick, greasy texture that looks identical to oil.

Boo hoo! The Tower Tearooms and The Tuck Shop are no more ...
In February (brrr!) 2023 via Paul McNamara [https://www.flickr.com/photos/pauljmcnamara/52713096446/]

Red Island again

This Faecsbook page reckons "circa 1928" - www.facebook.com
Includes another Eason near the tower with a motor car - catalogue.nli.ie

Classic!

Classic!

nice classic

wonderfullllllllllllll !!!!!!!!!!!!!!!!!!!!!!!

Classy

Fetching.