The Ashangi Basalts are the earliest Tertiary volcanic rocks in north Ethiopia, hence they are in the lowest position. These dark porphyritic basalts are separated from the Mesozoic formations below it by basal conglomerates. The basalts hold phenocrysts that developed before the magma reached the earth surface. These basalts are weathered, partially eroded and have a sub-horizontal stratification, particularly at the lower part. This series was created during the first period of the flood basalt eruptions in north Ethiopia, in the Oligocene.[1][2][3]
^Justin-Visentin, E. (1974). "Petrografia, chimismo e petrogenesi dei corpi subvulcanici di Macallè (Tigrai Etiopia)". Memorie dell'Istituto di Geologia e Mineralogia, Universita di Padova. 31: 1–33.
^Miruts Hagos and colleagues (2019). The volcanic rock cover of the Dogu'a Tembien massif. In: Geo-Trekking in Ethiopia's Tropical Mountains, the Dogu'a Tembien District. SpringerNature. ISBN 978-3-030-04954-6.
^Hofmann, C. and colleagues (1997). "Timing of the Ethiopian flood basalt event and implications for plume birth and environmental change". Nature. 389: 838–841. doi:10.1038/39853.
The AshangiBasalts are the earliest Tertiary volcanic rocks in north Ethiopia, hence they are in the lowest position. These dark porphyritic basalts are...
deposited on the lower AshangiBasalts and locally on intra-volcanic sedimentary rock. Like all volcanic rocks, the Alaji Basalts originate from initial...
years ago in the Oligocene with volumes reaching 350,000 km3 (AshangiBasalts, Alaji Basalts). Since then erosion has reduced areal extent and volumes. The...
Limestone, Agula Shale, sandstone of the Amba Aradam Formation and AshangiBasalts. The main driving factors that define the variability in soil types...
Tanqwa basin is composed of impervious rocks, particularly AshangiBasalts, Alaji Basalts and Precambrian basement rocks. The total amount of sediment...
belonging to two distinct and unconformable groups. The lower (Ashangi group) consists of basalts and dolerites often amygdaloidal. Their relation to the Antalo...