So, Bouldnor Cliff is a big wall made of rocks located in the water near an island called the Isle of Wight in England. Imagine it like a big underwater mountain made out of rocks!
A long time ago, even before the dinosaurs existed, there used to be all kinds of animals living in the water around Bouldnor Cliff. These animals were very special because they left their footprints on the rocks, almost like writing a message in the sand. Some of these animals were types of reptiles that swam in the water, and some were little creatures that crawled around on the ocean floor.
Now, scientists are really interested in studying these rocks and footprints to learn more about what happened all those years ago. They even have special machines that can take pictures and create models of the rocks! This helps them figure out how old the rocks are and what kinds of animals lived there.
So even though Bouldnor Cliff is just a big wall made of rocks, it holds a lot of information and secrets about what life was like a long, long time ago.