Context shot – seafront wall full of rocks with holes caused by natural erosion
Rocks 9-17 LRJCD – Rocks with holes made by natural erosion, and not resulting from any action by marine invertebrates such marine worms, sponges or bivalve molluscs. Probably classified as a type of honeycomb weathering and caused in part by exposure of sandstone type rocks to salt water and the elements. A wall along the seafront promenade at Lyme Regis, on the Jurassic Coast in Dorset, 21 June 2011,
Jessica's Nature Blog 
These features are also referred to as Tafoni – see e.g. https://www.worldatlas.com/articles/weathering-landforms-what-is-a-tafoni.html
Found around some coastal areas of BC where sandstone is eroded by sea action. Gabriola Island, Galiano Island and small examples on Nootka Island.
I’ve occasionally seen similar on certain types of limestone as well.
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You might like to try to access the article by Nick Doe. What makes holes in sandstone on the internet. He discusses these features on Gabriola Island BC. The article was published as follows:
Citation: Doe, N.A., What makes holes in sandstone, SHALE 9, 2d ed., pp.12–40, August 2004.
Copyright © 2004: Gabriola Historical & Museum Society. For reproduction permission e-mail: shale@gabriolamuseum.org
Google search doesn’t allow me to copy the URL here for some reason – it just downloads the pdf paper but I think http://www.nickdoe.ca/pdfs/Webp26c.pdf might work.
Hope this is of interest.
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Thank you for this information, Paddy. I was aware of the term tafoni but thought there was a distinction between them and honeycomb weathering to do with scale – with tafoni being on the larger size.
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This is really interesting. Thank you so much for the reference. It will fill a great gap in my knowledge I am sure. Gabriola Island seems to be a fascinating area too.
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