“…As has already been mentioned, the range of the isotopic variability of an environment is obtained by analysing contemporary water in a given area or the use of isotopic calculators (Daux et al, 2008;Gregoricka and Sheridan, 2017;Hamre and Daux, 2016;Müldner et al, 2011;Osipowicz et al, 2017;Parks, 2009) and/or analysing the remains of another human groups or animals who inhabited that area with the analysed groups of humans in different periods of time (Oleszczak et al, 2018;Parks, 2009;Shaw et al, 2010;Stepańczak, 2012).…”