Mertule Maryam flood volcanism terrain is situated in the southern part of the northwesternrnEthiopian plateau. The area is located 364 Km from Addis Ababa. The main objective of thernthesis work is to understand the petrography and stratigraphy of Mertule Maryam arearnvolcanic products and finally to assess the magmatic evolution. To accomplish thernobjectives, starting from the beginning various methods have been applied. The methods are;rnremote sensing, field observation, stratigraphy, petrography and geochemistry. The majorrnvolcanic units are plagioclase- pyroxene phyric basalt, agglomerate, aphyric basalt,rnplagioclase phyric basalt and undifferentiated aphyric basalt and tuff. The Mertule Maryamrnarea volcanic products show narrow variation in composition of SiO2 percentage (47.7 â€“ 51rnwt %) as mafic suits. Petrographic and stratigraphic observation of mafic samples from thernstudy area suggested three divisions within the study area. These are dominantly plagioclasepyroxenernphyric, aphyric flow and plagioclase phyric flood basalt units. This distinctivernpetrographic heterogeneity reveals difference in depth of fractionation and magma flux in thernlithosphere. The presence of plagioclase-pyroxene phyric basalt indicates there isrnconsiderable depth of fractionation in the shallow plumbing system. The aphyric basalt flowrnunit reflects there is no fractionation of any mineral in the shallow crust this indicates that thernrate of magma flux to the shallow plumbing system is high. In addition the presence ofrnplagioclase phyric basalt suggested that there was fractionation in the shallow plumbingrnsystem. Selected variation diagrams for major element and trace element shows scatteredrnplot pattern which suggests these volcanic products are not the result of simple fractionationrninstead they do have different ways to come to the lithosphere.