Tor Bay is bounded by outcrops of
Devonian limestone forming its northern limit at Hope's Nose and its southern at
Berry Head. The geology of the area is varied and complex, recognised by the 2007 designation of the
English Riviera Geopark which includes all of Tor Bay's coastline. During the
last glacial period, when sea level was much lower, Tor Bay was dry land, as is shown by the existence of a
submerged forest in the bay. It was overwhelmed during the
Flandrian transgression which started about 10,000 years ago.{{Cite book | title=The Geology of Devon| publisher=University of Exeter| year=1982 ==History==