These look to me like regular intrusive iron rich veins. Boulder is about 1m across, and sandstone/mudstone, area is volcanic.
I am not a geologist.. any ideas?
cross-posted from: https://lemmy.world/post/7307475
Eastern entrance to Pentonville Tunnel and tunnel keeper's cottage, Regent's Canal, London
Credit 1905: https://www.sciencephoto.com/media/980309/view/pentonville-tunnel-regent-s-canal-london-c1905 credit 2013: Google Streetview
cross-posted from: https://lemmy.world/post/1710731
Credit:
1910 - View of the Wesleyan Church, Northcote, Auckland. Price, William Archer, 1866-1948 :Collection of post card negatives. Ref: 1/2-001681-G. Alexander Turnbull Library, Wellington, New Zealand. /records/22778618
2023 - Google Streetview
