Figure 2.

Chronology of Atlantic walrus specimens in Europe. (a) Archaeological specimens classified as western clade (blue) or eastern clade (orange) are plotted according to their estimated age range. The start and end of the Norse Greenland occupation, the founding of the bishopric, and the arrival of the Black Death in Norway are indicated (dashed red lines). For each specimen, its location (light grey) is indicated. (b) Probability of obtaining the observed sample of eastern and western clade specimens as a function of a variable contribution of a western Greenland source. The probability was calculated for those samples obtained before (dark grey) or after (light grey) the founding of the Greenland bishopric, excluding the sixteenth and seventeenth century CE specimens.