Sinous channel being eroded in intertidal rock layers

Today I am mostly thinking about the way these seawater drainage channels are being formed in intertidal rock and what factors contribute to their sinuosity. They occur low on the beach at Seatown in Dorset, England, in the calcareous mudstones of the Belemnite Member of the Charmouth Mudstone Formation. More thoughts to follow later on the subject of this coastal erosion process.

10 Replies to “Sinuous Channels at Seatown 1”

  1. Thank you, Evelyn. It is always exciting to discover something different. There are so many interesting natural phenomena around, especially on this Jurassic Coast..


  2. Hi, RH. My theorising about the formation of the sinuous channels is revealed in the following post “Seatown Dissected Mudstone Layers”. Basically, naturally-occurring polygonal cracks are occupied by mud-tube worms that make burrows; water flow wears down these weakened areas; and these surface depressions can join up in series to make channels. In addition, once the channels are formed, pebbles get stuck in them, causing water to flow around them, adding to the slow scouring of the channel walls, accentuating the sinuosity.


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