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The characteristics relating to the lateral and longitudinal development ofEAS in the energy region of 10^15-10^19eV have been analyzed in the frameworkof the QGSJET model and of mass composition of primary cosmic rays. It is foundthat at E(0) >= 5*10^15eV the mean mass composition of primary cosmic raysbegins to vary as indicated by a rise of <ln A> with increasing energy. Themaximum value of <ln A> is observed at E(0) ~ (5-50)*10^16eV. It is confirmedby data of many compact EAS arrays and does not contradict an anomalousdiffusion model of cosmic ray propagation in our Galaxy. In the superhighenergy region (>=10^18eV) the value <ln A> begins to decrease, i.e. the masscomposition becomes lighter and consists of protons and nuclei of He and C. Itdoes not contradict our earlier estimations for the mass composition and pointsto a growing role of the metagalactic component of cosmic rays in the superhighenergy region.

Average mass composition of primary cosmic rays in the superhigh energy region by Yakutsk complex EAS array data