Oolite!

No no, not  THAT  kind of light.
THIS  kind of lite...
"dedolomitized grey oolite" that is "extensively brecciated, passing down to buff ooidal dolomite with scattered bivalve moulds" next to "cliffs composed of drift on east dipping faulted sequence of Seaham Residue on Roker Dolomite" - formerly known to me as the Featherbed Rocks.
Can you tell we had a fab guided Geology walk today?
Courtesy of PaulaJ
https://www.blipfoto.com/entry/2221699654003720940