The Cenozoic Harrat Ash-Shaam Basaltic Super-group (HASB) of northeast Jordan covers some 11,400 km2. The HASB is subdivided into groups and formations of which the rock units shown in the geological map are exposed in the study area. The Aritayn Volcaniclastic Formation (Pliocene-Quaternary) is most important of all. It consists of bedded, poorly cemented air-fall pyroclastics that are developed at composite stratovolcanic centers like Jabal Hannoun volcano. Lithologically, the Aritayn Volcaniclastic Formation is made up of stratified fine-grained ash, angular and spherical lapilli, as well as basaltic bombs, forming poorly-cemented tuffs and agglomerates. These contain authigenic zeolites including faujasite occurring as cement to the volcanic clasts.