Eustatic Control of Major Cyclic Changes in Jurassic Sedimentation

Abstract

Evidence is sought to prove, with reference to five examples, that major cyclic changes in Jurassic sedimentation have been controlled by eustatic rises and falls of sea level. Abrupt variations suggestive of pronounced deepening of the sea in areas of marine sedimentation in Europe are correlated with extensive marine transgressions in widely separated parts of the world. A connection is recognized between eustatic movements and evolution and migration of the invertebrate fauna, and relationships between eustatic and local, epeirogenic movements outlined.