"The base is delimited by a prominent weathered-out bedding plane immediately above the Altachuile Breccia (Bed) of the Ballintoy Chalk Formation. Brecciated chalk overlain by a thick limestone unit forming the base of the Glenarm Chalk Formation."@en . "72.2"^^ . . "stable"@en . . . "GAC"@en . . . "83.7"^^ . . . "Glenarm Chalk Formation"@en . . "Glenarm Chalk [Obsolete: use GAC]"@en . "The upper boundary is the weathered-out bedding plane that separates chalk with small tabular flints below from conspicuously shelly wavy-bedded chalk at the base of the conformable Garron Chalk Formation, above."@en . "Glenarm Chalk Member [Obsolete: use GAC]"@en . "8.10m at the type area."@en . "Glenarm Chalk Formation"@en . "Limestone (chalk), with flints ranging from small nodular at the base through nodular to tabular flints in the middle part of the sequence to massive nodular at the top. The Formation can be divided into four \"Beds\" (A to D) by subdivision on bedding planes. In the North Antrim Basin the Formation includes two well-developed hardgrounds, the North Antrim Hardgrounds (of member? status) and the sequence is therefore incomplete. In the Midland Valley (East Antrim) Basin only limited wavy bedding and scattered green glauconitised pebbles indicate interrupted sedimentation. This area is regarded as the \"standard\"."@en . . "Chalk and limestone with subsidiary flint. Stratified bedrock. Occurs onshore. Deposited during the Campanian Age (Cretaceous Period) (83.7-72.2 Ma BP)."@en . .