Geological Formation
During the Jurassic Period (195 to 135 million years ago) the region that is now Bath was under a shallow sea. Layers of Marine sediment built and individual spherical grains were coated with lime as they rolled around the sea bed forming the Bathonian Series of rocks. Under the microscope, these grains or ooliths (egg stone) are sedimentary rock formed from ooids, spherical grains composed of concentric layers. The name derives from the Hellenic word òoion for egg. Strictly, oolites consist of ooids of diameter 0.25–2 mm: rocks composed of ooids larger than 2 mm are called pisolites. They frequently contain minute fragments of shell or rock and sometimes even decayed skeletons of marine life.
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