- 1 In which period did layers of sandstone form in Ethiopia?
- 2 What construction material resources do we find in Ethiopia?
- 3 What is the oldest sedimentary rock in Ethiopia?
- 4 What is the age range for Ethiopian basement rock?
- 5 What minerals are found in Ethiopia?
- 6 Where are the major potential sites of Ethiopia?
- 7 What gemstones are found in Ethiopia?
- 8 Is there mica in Ethiopia?
- 9 What are the 5 examples of sedimentary rocks?
- 10 What are the 3 main types of sedimentary rocks?
- 11 What are three examples of sedimentary rocks?
- 12 What does greywacke mean?
- 13 What is the major drainage in Ethiopia?
- 14 Why is it called Vishnu schist?
In which period did layers of sandstone form in Ethiopia?
The upper limit of Adigrat Sandstone is of Middle-Late Jurassic age (around 160 million years or Ma ago) whereas the lower boundary is Triassic (200 Ma). Adigrat Sandstone.
|Adigrat Sandstone Stratigraphic range: Late Triassic–Early Jurassic PreꞒ Ꞓ O S D C P T J K Pg N|
|Named by||William Thomas Blanford|
|Adigrat Sandstone ( Ethiopia )|
What construction material resources do we find in Ethiopia?
Basalt, tuffs and ignimbrite are extensively used for local housing and construction in Ethiopia. Such resources represent a potential for low-cost supply of an excellent construction material, and could be developed further.
What is the oldest sedimentary rock in Ethiopia?
Rocks formed by the East African Orogeny 880 to 550 million years ago make up the oldest geological units in Ethiopia. Sedimentary rocks of Ordovician age cover this surface making it largely an unconformity.
What is the age range for Ethiopian basement rock?
600 m of Late Jurassic-Early Cretaceous sediments. The altitude of the plateau ranges from 3000 to 4000 m in the northeast and around 1500 m in the southwest, with an average height between 1800 to 2500 m. The basement of Ethiopia consists of metamorphic and igneous rocks of Precambrian and Lower Paleozoic age.
What minerals are found in Ethiopia?
Minerals which are known to occur in Ethiopia, but of which supplies are deficient, or which have not yet been proved to exist in economic quantities are: nickel, iron, chromium, mineral fuels (oil, coal and uranium), sulphur, asbesttos, mica, talc, barytes, fluorites, borates, soda-ash, phosphates, wolframite,
Where are the major potential sites of Ethiopia?
Ethiopia is full of potential. Both the salt brines in the marine strata of southern Ethiopia and the saline springs associated with volcanic activity in the Ethiopian rift of Afar are likely to contain lithium, in addition to the trace elements and edible salt currently produced.
What gemstones are found in Ethiopia?
Ethiopia has many varieties of high quality gemstones, including opals, emeralds, sapphires, amazonite, amber, rubies, tourmaline, aquamarine, chrysoprase, periodt, and as well as various types of quartz, agate, jasper.
Is there mica in Ethiopia?
Mica is a mountain in Ethiopia and has an elevation of 2179 metres. Mica is situated north of Fent’er.
What are the 5 examples of sedimentary rocks?
Examples include: breccia, conglomerate, sandstone, siltstone, and shale. Chemical sedimentary rocks form when dissolved materials preciptate from solution. Examples include: chert, some dolomites, flint, iron ore, limestones, and rock salt.
What are the 3 main types of sedimentary rocks?
There are three different types of sedimentary rocks: clastic, organic (biological), and chemical. Clastic sedimentary rocks, like sandstone, form from clasts, or pieces of other rock.
What are three examples of sedimentary rocks?
Common sedimentary rocks include sandstone, limestone, and shale. These rocks often start as sediments carried in rivers and deposited in lakes and oceans.
What does greywacke mean?
Greywacke or graywacke (German grauwacke, signifying a grey, earthy rock) is a variety of sandstone generally characterized by its hardness, dark color, and poorly sorted angular grains of quartz, feldspar, and small rock fragments or lithic fragments set in a compact, clay-fine matrix.
What is the major drainage in Ethiopia?
Ethiopia has three principal drainage systems. The first and largest is the western drainage system, which includes the watersheds of the Blue Nile (known as the Abay in Ethiopia ), the Tekeze, and the Baro rivers. The third system is that of the Shebele and Genale rivers.
Why is it called Vishnu schist?
Fluting is created by centuries of weather and erosion. Interestingly, in the 1800’s, geologist Charles Walcott names the Vishnu Schist rock layer after the Vishnu Temple. It was common practice to name the rock layers of the Grand Canyon after the names of buttes and mesas.