Listeners propose keyline plow and Iron Age flooding theories for cart ruts. Yeomans keyline plow theory proposed with chisel implements drawn through soft material Keyline plow would follow land contours for water capture in arid conditions Separate theory proposed Iron Age flooding created sapropel bogs in the Friian Valley around the 8th century BC
Two more theories emerged: Yeomans keyline plows with chisel implements following land contours, or Iron Age floods around the 8th century BC creating sapropel bogs. The bog idea would explain why no animal tracks accompany the ruts — mud floods could bury old tracks, forcing new routes. Both were partially challenged by the worn center between ruts. 💡
Key Facts
- Yeomans keyline plow theory proposed with chisel implements drawn through soft material
- Keyline plow would follow land contours for water capture in arid conditions
- Separate theory proposed Iron Age flooding created sapropel bogs in the Friian Valley around the 8th century BC
- Sapropel refers to lake-bottom sediment or organic matter accumulation under water
- Bog theory explains why no animal tracks accompany cart ruts in soft material
- Flood events could bury old tracks in mud, forcing new routes to be created
- Both theories were debated and partially debunked due to the worn center between paired ruts
Related site: Cwm Era Slate Quarry, Dulas Valley;Fronfelin; Fronfelin Slate Quarry — view location, images, and history on the Ancient Nerds map.
Source: "Cart Ruts" in Stone - Mystery STILL Not Solved by Brothers of the Serpent