No. | Code | Description of Geologic class |
Quaternary Volcanics and Sediments | ||
1 | Q | Undivided alluvium, eluvium and lacustrine sediments |
2 | Qa | Alluial deposits: Gravel, sand silt and clay |
3 | Qe | Eluvium: Red to reddish brown sandy soil black cotton soil calcrite, minor ferricrite, silt clay |
4 | Qv6 | Augite-olivine-phyric basalt, scoraceous-vesicular with xenoliths of mantle nodules |
5 | Qv5 | Pyroclastic surge deposits: Lapilli tuff |
6 | Qv4 | Olivine-phyric-basalt |
7 | Qv3 | Pyrocalistic surge deposits: Lapilli tuff |
8 | Qv2 | Augite-abradorite-lapilli tuff |
9 | Qv1 | Pyrcasitic surge deposits: Mainly bedded fall deposits scoria, rock fragments |
10 | Qv | Scoraceous-vesicular-oilivine-phyric basalt |
Tertiary Volcanic Sucessions | ||
11 | Nn | Nazeret Group: Stratoid silics-ignimbites, tuffs, ash, rhyolites, trachye, minor basalt |
12 | Ntr3 | Alkal trachyte flows |
13 | Ntr2 | Alkali trachyte and basalt flows |
14 | Nb | Bulal Basalt flows |
15 | NMv | Upper basal flows |
16 | PNtr1 | Alkali trachyte and basalt flows, rhyolitic ignimbrite, minor tuff and bassal flows |
17 | NMt | Teltele basalt flows |
18 | PNi | Ignimbrite, minore tuff and bassalt |
19 | PNb2 | Ankaramite and minor divine-phyric basalt |
20 | PNb1 | Lower flood basalts |
21 | Tsy | Hornblende-Alkali syenite, minor hornblende-nepheline syenite |
Mesozoic Sedimentary Successions | ||
22 | Ka | Amba Aradam formation: Varicoloured sandstones with inter beddding |
23 | Km | Mustahil formation: Limestones inerbedded with shales and marls |
24 | Kg2 | dominantly gypsum and anhydraites with beds of limestones, shales, marl and iron carbonate rock |
25 | Kg1 | Korahe formation: Lower unit dominantly sandstones with bes of dolomites, limestones marl, shale, gypsum and anhydrites |
26 | Jg | Gabredarre formation: Micritic to microcrysaline and oolitic limestones |
27 | Jh2 | Hamanlei formation: Micritic locally oolitic (grainstone) peletic limestones |
28 | Jh1 | Hamanlei formation: Less fossiliferous limestones with beds of calcareous sandstone |
29 | Ja | Adigrat formation: Variegated quatzos sanstones, intercalations of siltstones, shales and intrafomational conglomerates |
Precambrean-Early Paleozoic Basement Cmplexes | ||
30 | pcgt2 | Blotite and homblende granites |
31 | pcdt | Meta-quartz diorite plutonic bodies |
32 | pcgb1 | Metagabbro |
33 | pcgd | Metagranodiorite |
34 | pcgt1 | Biotite metagranite |
35 | pcdt2 | Quartz metadiorite |
36 | pcdt1 | Melka Guga diorite gneiss |
Mafic-Ultramafic-Volcano-Sedimentary Assemblages | ||
37 | pckb | Kajimiti Beds: Metasandstone and metaconglomerate |
38 | pcsc3 | Metasediments: philite, metasiltstone melasandstone, micaschists, quartz-graphite-muscovite, kyanite-muscovit schists |
39 | pcsc2 | Metavolcanics: Amhibotite and plagioclase-chlorite-actinitit schist |
40 | pcsc1 | Subvolcanic amphibolite |
41 | pcum2 | Metaomblendite |
42 | pcgb2 | Metagabbro |
43 | pcum4 | Talc, tremolite-Chiorite-talc, chlorite, chlorite-actindite and actinolite schists |
44 | pcum3 | Serpentinite |
45 | pcum1 | Undeferentiated metaltramafics |
Gneissic and Migmataitic Complexes | ||
46 | pcgn11 | Quartz-graphite schist, minor marble and quartz-sericite schist |
47 | pcgn10 | Biotite-microline-quartz and gamet-staurolite-gneises and amphibolite |
48 | pcgn9 | Biotite-quartz-oligoiase gneiss, amphibolite and digoclase-quartz-microcline gneiss |
49 | pcgn8 | Strongly migmatized-bioite-quartz-felspar gneiss(paragneisses) |
50 | pcgn7 | Oligoclase-hornblende-biotite-quartz, biotite-hornblende, biotite and calcsilicate |
51 | pcgn6 | Quartzofeldspathic gneiss, minor biotitie-feldspar-quartz gneiss and biotite granite pods |
52 | pcgn5 | Magetite-quartzofeldspathic gneiss |
53 | pcgn4 | wadera mylonite and mylonitic gneiss |
54 | pcgn3 | Hornblende-biotite-quartz-feldspar and biotite-quartz-feldspar gneisses |
55 | pcgn2 | Biotite-hornblende gneiss |
56 | pcgn1 | Granulite-quartzofeldspathic gneiss |