page_title: Shammar Mountains
section_title: Geology
hierarchical_section_title: Shammar Mountains / Geology
caption_attribution_description: شعيب جو بجبال أجـــا
context_page_description: The Shammar Mountains is a mountain range in the northwestern Saudi Arabian province of Ha'il. It includes the Ajā and Salma subranges.
context_section_description: The Aja Mountains are to an extent made up of granite, whereas the Salma are made up of basalt. The phrase "Hadn formation" was used by Chevremont (1982) to refer to volcanic rocks of the area of Ha'il, and was treated by Hadley and Schmidt (1980) as being part of a silicic and volcaniclastic sequence referred to as the "Shammar group", in a broader, regional context.
caption: Aja landscape
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