THE CRETACEOUS SYSTEM IN NORTHERN IRELAND

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Abstract
This paper is a general study of Cretaceous stratigraphy in Ireland. The Cretaceous here is broadly divisible into two parts—an upper division of pure hard chalk known as the White Limestone and a lower division of more or less glaucontie sediments known as the Hibernian Greensands. The Hibernian Greensands are found in two districts: County Derry where they are mostly Senonian, and south-east Antrim where they are Cenomanian and Senonian. They are very variable from place to place and sometimes much condensed. Although limited to lowland areas, the original Lower Cenomanian transgression in Antrim probably extended farther west than the present limits of the Greensands. These more westerly sediments were upfaulted and eroded, mostly during the Middle Senonian, before the mucronta Zone transgression carried chalk sedimentation over most of Ireland.

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