Amba Aradam
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Amba Aradam is a
table mountain Table Mountain ( naq, Huriǂoaxa, lit= sea-emerging; af, Tafelberg) is a flat-topped mountain forming a prominent landmark overlooking the city of Cape Town in South Africa. It is a significant tourist attraction, with many visitors using the ...
in northern
Ethiopia Ethiopia, , om, Itiyoophiyaa, so, Itoobiya, ti, ኢትዮጵያ, Ítiyop'iya, aa, Itiyoppiya officially the Federal Democratic Republic of Ethiopia, is a landlocked country in the Horn of Africa. It shares borders with Eritrea to the ...
. Located in the Debub Misraqawi (Southeastern) Zone of the
Tigray Region The Tigray Region, officially the Tigray National Regional State, is the northernmost regional state in Ethiopia. The Tigray Region is the homeland of the Tigrayan, Irob, and Kunama people. Its capital and largest city is Mekelle. Tigray ...
, between Mek'ele and
Addis Abeba Addis Ababa (; am, አዲስ አበባ, , new flower ; also known as , lit. "natural spring" in Oromo), is the capital and largest city of Ethiopia. It is also served as major administrative center of the Oromia Region. In the 2007 census, t ...
, it has a latitude and longitude of and an elevation of . The name in Tigrinya is ''Imba Aradom'', but international usage in geology (
Amba Aradam Formation The Amba Aradam Formation is a Cretaceous sandstone formation in Ethiopia. It is up to 200 metres thick, for instance in the Degua Tembien district. As fossils are absent, the age of the Amba Aradam Formation was interpreted based on the age of a ...
) and history (battles in the 1930s) have coined the name ''Amba Aradam''.


Geology

The outcropping
bedrock In geology, bedrock is solid rock that lies under loose material ( regolith) within the crust of Earth or another terrestrial planet. Definition Bedrock is the solid rock that underlies looser surface material. An exposed portion of be ...
consists of
Jurassic The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of ...
, sub-horizontally layered or slightly inclined, marine varicoloured marls and marly clays with interbedded limestones, sandstones and
gypsum Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula . It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard or sidewalk chalk, and drywa ...
layers, that are part of the Agula Shales Formation. These are
unconformably An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older layer was exposed to erosion for an interval ...
overlain by
Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of ...
continental
conglomerate Conglomerate or conglomeration may refer to: * Conglomerate (company) * Conglomerate (geology) * Conglomerate (mathematics) In popular culture: * The Conglomerate (American group), a production crew and musical group founded by Busta Rhymes ** ...
s,
sandstones Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) ...
and
laterite Laterite is both a soil and a rock type rich in iron and aluminium and is commonly considered to have formed in hot and wet tropical areas. Nearly all laterites are of rusty-red coloration, because of high iron oxide content. They develop by ...
levels, belonging to the
Amba Aradam Formation The Amba Aradam Formation is a Cretaceous sandstone formation in Ethiopia. It is up to 200 metres thick, for instance in the Degua Tembien district. As fossils are absent, the age of the Amba Aradam Formation was interpreted based on the age of a ...
, which is obviously named after the mountain. The unconformity is due to a planation episode which followed the pre-Cretaceous
marine regression A marine regression is a geological process occurring when areas of submerged seafloor are exposed above the sea level. The opposite event, marine transgression, occurs when flooding from the sea covers previously-exposed land. Evidence of marin ...
.
Dolerite Diabase (), also called dolerite () or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine-grain ...
sill Sill may refer to: * Sill (dock), a weir at the low water mark retaining water within a dock * Sill (geology), a subhorizontal sheet intrusion of molten or solidified magma * Sill (geostatistics) * Sill (river), a river in Austria * Sill plate, ...
s and laccolites of
Oligocene The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but t ...
age are interlayered within the Agula Shales. Small dolerite necks are exposed on the westernmost edge of the upper escarpment and west of the Amba Aradam summit.


Vegetation

The present-day spontaneous vegetation is dominated by Juniperus procera,
Eucalyptus camaldulensis ''Eucalyptus camaldulensis'', commonly known as the river red gum, is a tree that is endemic to Australia. It has smooth white or cream-coloured bark, lance-shaped or curved adult leaves, flower buds in groups of seven or nine, white flowers an ...
and
Podocarpus gracilior ''Afrocarpus gracilior'' (syn. ''Podocarpus gracilior'') is a species of coniferous tree in the family Podocarpaceae known as benet in Marakwet and East African yellowwood, African fern tree, or bastard yellowwood in English It is native to e ...
, although farming and grazing have reduced it to a sparse shrub cover, except for limited areas around churches where the holy character of the places allows their preservation.


Settlements

Human settlements are scattered around the main relief, being usually located on the most favourable topographic situations, such as flat surfaces and foot slopes, where colluvial deposits allow subsistence farming. Major town on the foot of the mountain is
Hintalo Hintalo ( ti, ሕንጣሎ), also called Antalo, was Administrative Center of Enderta’s historical wereda of Gabat Melash, is a small town located in the Debub Misraqawi (Southeastern) Zone of the Tigray Region of Ethiopia. It lies on a platea ...
, which used to be capital of Tigray in the 19th century, after which large parts of the town were abandoned. Ruins of the abandoned quarters were observed in 1868 and are still present nowadays.


History

The mount is famous for the Battle of Enderta that the Italians fought in order to capture Amba Aradam on 15 February 1936, and for the massacre three years later, as an action against the ''
Arbegnoch The Arbegnoch () were Ethiopian resistance fighters in Italian East Africa from 1936 until 1941. They were known to the Italians as shifta. Organisation The Patriot movement was mostly based in the rural Shewa, Gondar and Gojjam provinces, ...
'', or Ethiopian partisans. Between 9–11 April 1939, a group of ''Arbegnoch'', led by Abebe Aregai, had taken refuge in the Amezena Washa (Cavern of the Rebels), which was in Amba Aradam. The party included members of the ''Arbegnoch'', but also their relatives, wounded, and other refugee non-combatants. On 9 April 1939, the chemical platoon of the Granatieri di Savoia Division attacked the ''Arbegnoch'' using bombs with poison gas, killing most of those inside. Only fifteen persons succeeded in escaping from the cave. Those who continued the resistance inside the cave were killed with flamethrowers. The extent of the cave made it difficult to explore for the remaining members of the resistance who were still within, so the Italian military command gave the order to seal it with explosives: Paolo Rumiz
"Etiopia: quella strage fascista mai raccontata"
'La Repubblica'', 22 Maggio 2006.


References

{{reflist Mountains of Ethiopia Tigray Region