Paleozoic Era Geologic Processes

<p>Marine deposits</p> Signup and view all the answers

<p>Epeirogenesis</p> Signup and view all the answers

<p>Compression by the overlying rocks and cementing minerals</p> Signup and view all the answers

<p>A place name in Tigray</p> Signup and view all the answers

<p>Adigrat sandstone</p> Signup and view all the answers

<p>25%</p> Signup and view all the answers

<p>Uplift of the landmass</p> Signup and view all the answers

<p>Paleozoic Era = 375 million years Mesozoic Era = 155 million years Precambrian Era = Unknown Cenozoic Era = Unknown</p> Signup and view all the answers

<p>Denudation = Paleozoic Era Epeirogenesis = Mesozoic Era Orogeny = Precambrian Era Subsidence = Cenozoic Era</p> Signup and view all the answers

<p>Somalia and Ogaden = Sea invasion and sand deposition Northwest region = Higher elevation due to land tilting Southeast region = Lower elevation due to land tilting Entire Horn of Africa and Arabian landmass = Alternate sinking and rising</p> Signup and view all the answers

<p>Formation of undulating plain with residual features = Denudation Transportation of sediments to form marine deposits = Intense denudation Formation of peneplained surface = Gigantic mountains subjected to denudation Limited deposition of rocks within Ethiopia = Rare rocks belonging to this era</p> Signup and view all the answers

<p>Mesozoic rocks = Sandstone and limestone layers Paleozoic rocks = Limited deposition in Ethiopia Precambrian rocks = Unknown potential deposits Cenozoic rocks = Greatest potential for oil and gas deposits</p> Signup and view all the answers

<p>Adigrat sandstone = Deposition due to the regression of the sea Hintalo limestone = Association with the flourishing of marine life Upper sandstone = Formation upon the Precambrian rock surface Gypsum and shale = Inter-bedded above and below the Hintalo limestone</p> Signup and view all the answers

<p>Flourishing of marine life and deposition of lime = Mesozoic Era Subsidence of the land and deposition of clay, silt, and sand conglomerate = Cretaceous period Tilting of the landmass during transgression and regression of the sea = Mesozoic Era Intense denudation during transgression and regression of the sea = Paleozoic Era</p> Signup and view all the answers

<p>Compression by overlying rocks and cementing minerals = Formation of sandstone and limestone layers in Mesozoic rocks End of sedimentation in the country = Deposition of clay, silt, sand conglomerate brought in from the land as the sea receded due to uplift of the landmass Decaying and precipitating of marine life remains = Formation of Hintalo limestone Tilting of the landmass during transgression and regression of the sea = Formation of Upper Sandstone</p> Signup and view all the answers

<p>Adigrat sandstone = Named after place names in Tigray where they might have been first identified Hintalo limestone = Named after place names in Tigray where they might have been first identified Upper sandstone = Named after place names in Tigray where they might have been first identified Mesozoic sedimentary rocks = Cover 25% of the land mass of Ethiopia</p> Signup and view all the answers

<p>Subsidence of the land = Deposition of gypsum, shale, and sands over Hintalo limestone Retreat of the sea = Deposition of clay, silt, and sand conglomerate brought in from the land as the sea receded due to uplift of the landmass Rise of the land and regression of the sea = Formation of Adigrat sandstone and Hintalo limestone layers Uplift of the landmass = End of sedimentation in the country</p> Signup and view all the answers