Bath and North East Somerset Age hill fort or stock enclosure. A Long barrow site believed to be from the Beaker people was flattened to make way for RAF Charmy Down. The archaeological evidence shows that the site of the Roman Baths' main spring was treated as a shrine by the Celts, and was dedicated to the goddess Sulis, whom the Romans identified with Minerva; however, the name Sulis continued to be used after the Roman invasion, leading to Bath's Roman name of "Aquae Sulis" (literally, "the waters of Sulis"). Excavations carried out before the flooding of Chew Valley Lake also uncovered Roman remains, indicating
Aphanizomenon flos-aquae toxic chemicals released when cells die. Once released (lysed), and ingested, these toxins can damage liver and nerve tissues in mammals. In areas where water quality is not closely monitored, the World Health Organization has assessed toxic algae as a health risk, citing the production of anatoxin-a, saxitoxins, and cylindrospermopsin. Dogs have been reported to have become ill or have fatal reactions after swimming in rivers and lakes containing toxic "A. flos-aquae". Microcystin toxin has been found in all 16 samples of "A. flos-aquae" products sold as food supplements in Germany and Switzerland, originating from Lake Klamath: 10 of 16