There are four main reasons for this period being called the Marginal Revolution.
First, during the late nineteenth century much of the focus in economics turned from the classical long-term development, that is the theory of population, welfare and growth, towards shorter terms. The use of capital and labour in production, the choices of the consumer and utility became important subjects. As hinted by the phrasing «the Marginal Revolution», the theory of decisions made at the margin was much studied and strongly influenced future economics. This goes especially for the theory of marginal utility.
Second, the use of mathematics became more and more common, though Jevons did not particularly contribute to this development. Walras was the major contributor on this field. As mentioned earlier, von Thünen, Cournot and some others began this way of looking at economics some years before Jevons’ time, but the majority did not. However, in the 1870's, largely due to the major advances in natural science, the general view in economics took a more mathematical approach.
More than the pioneers mentioned earlier, Jevons, Menger and Walras incorporated these new theories into a system. And perhaps more importantly, more than earlier these thoughts gained acceptance among the scientific environment. Although both Walras and Menger wrote important works in the field of marginal utility and the use mathematics in economics, Jevons developed his theories rather individually.
Finally, the generation of economist including Jevons was, as mentioned earlier, among the first to have a formal education in economics. Thus the scientific field gradually turned towards being a profession, which is rather different from earlier economists.