During the period from 1962 to 1973 Raymond Casey produced several ground-breaking papers on the Upper Jurassic of eastern England. These included the recognition that genera, previously thought to be of Early Cretaceous age, were in fact of latest Jurassic age. This led him to produce new correlations with the latest Jurassic of southern England, to identify the Jurassic-Cretaceous boundary within the Purbeck Limestone Group and to determine new correlations of the uppermost Jurassic succession of Britain with the Volgian Stage of the Russian Platform. These ideas are discussed and an assessment made of their validity in the light of subsequent revision. Re-assessment of the validity of the Oppressus Zone suggests new correlations between southern and eastern Britain in latest Jurassic times.

在1962年至1973年期间，雷蒙德·凯西（Raymond Casey）在英格兰东部的上侏罗统上发表了几篇突破性的论文。这些包括承认以前被认为是早白垩纪的属实际上是最近的侏罗纪。这使他产生了与英格兰南部最新侏罗纪的新关联，从而确定了Purbeck石灰岩群内的侏罗纪-白垩纪边界，并确定了英国最侏罗纪演替与俄罗斯台地伏尔盖期的新关联。讨论了这些想法，并根据后续修订对其有效性进行了评估。对压迫区有效性的重新评估表明，在最近的侏罗纪时期，英国南部和东部之间存在新的关联。