The Shammar Mountains ( ar, جِبَال شَمَّر, Jibāl Shammar) is a mountain range in the northwestern

Saudi Arabia Saudi Arabia, officially the Kingdom of Saudi Arabia (KSA), is a country in Western Asia. It covers the bulk of the Arabian Peninsula, and has a land area of about , making it the fifth-largest country in Asia, the second-largest in the A ...

n province of Ha'il. It includes the Ajā () and Salma subranges.

Geology

The Aja Mountains are to an extent made up of

granite Granite () is a coarse-grained ( phaneritic) intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies under ...

, whereas the Salma are made up of

basalt Basalt (; ) is an aphanitic (fine-grained) extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron (mafic lava) exposed at or very near the surface of a rocky planet or moon. More than 90 ...

. The phrase "Hadn formation" was used by Chevremont (1982) to refer to

volcanic rock Volcanic rock (often shortened to volcanics in scientific contexts) is a rock formed from lava erupted from a volcano. In other words, it differs from other igneous rock by being of volcanic origin. Like all rock types, the concept of volcanic ...

s of the area of Ha'il, and was treated by Hadley and Schmidt (1980) as being part of a

silicic Silicic is an adjective to describe magma or igneous rock rich in silica. The amount of silica that constitutes a silicic rock is usually defined as at least 63 percent. Granite and rhyolite are the most common silicic rocks. Silicic is the grou ...

and

volcaniclastic Volcaniclastics are geologic materials composed of broken fragments ( clasts) of volcanic rock. These encompass all clastic volcanic materials, regardless of what process fragmented the rock, how it was subsequently transported, what environment it ...

sequence referred to as the "Shammar group", in a broader, regional context.

Wildlife

The protected area of Jabal Aja is of

ecological Ecology () is the study of the relationships between living organisms, including humans, and their physical environment. Ecology considers organisms at the individual, population, community, ecosystem, and biosphere level. Ecology overlaps wi ...

significance. Two Asiatic cheetahs, the last known in the country, were killed near Ha'il in 1973, and their skins kept near the Imara Palace for a few days.

Peaks

* Mount Aja ( ar, جَبَل أَجَا, Jabal Ajā) * Mount Samra' ( ar, جَبَل ٱلسَّمْرَاء, Jabal As-Samrā’)

Gallery

File:Alsamra.jpg, A view of Ha'il City from the top of Samra Mountain File:صورة طائر غريب من وحي الطبيعة - panoramio - Abothamer Homoud.jpg, Natural bird shape File:Mahagah2.jpg, Mahajah rock formation

References

External links

The tantalizing Aja and Salma mountains in Hail, northwest of Saudi Arabia
(

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