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The fact that surprised me about chalk was that there are prehistoric mines in the chalk digging for flints. That made me wonder what flint is, the chalk is fossil material. It turns out the flints are fossilized jellyfish of a silica base, There must have been thousands of them.Looks like the footprints have been found in the sandstone which is next to the chalk. The article is on the national news as I type.
The chalk is a soft limestone, not quite hard enough to build with, but does have some fossils in it. I've found oysters and sea urchins and sometimes pyrites nodules that have replaced organic materials.
The news article showed a 3 toed footprint that they found while filming View attachment 82009
Ps. I once took down the peg tiles from an old farmhouse to remove a swarm of bees that had got behind it. Putting it back was a hell of a job as the stringers the tiles were hung on had warped out of shape and the tiles were hand made with peg holes at various heights. I had to make up a batch of lime mortar to bed the pegs into and sort out tiles that fitted each stringer, it was like doing a huge vertical jigsaw on a ladder with almost identical pieces. The hardest work of any swarm I ever took.