Cretaceous
Though famous for its land fauna, the Cretaceous sea level rose much higher than today. North America was partly covered by an epicontinental inland sea, and half of Britain was under water. One account goes as follows: "During the Late Cretaceous (94–64 mya) sea level was up to 650 metres higher than at the start of the Albian, when it was perhaps about the same as it is today... The peak transgressions (sea levels) can be seen world-wide. There were rises of sea level of about 10–90 metres per m.y."