Oscar Montelius refined the concept of typology, a relative chronological dating method. Typology is the procedure of working out a chronology by arranging material remains of a culturaltradition in the order that produces the most consistent patterning of their cultural traits. Typologies are the basis for seriation, a technique developed by Sir William Matthew Flinders Petrie based on his excavations in Egypt. Montelius' impetus was at first to provide relative dates for artifacts in museum collections that often lacked rigorous records, by making comparisons with other artifacts within a comparable geographical area. Montelius’ method created a timeline specific to the location, based on material remains. Later, when combined with written historical references, objects could be provided absolute dates. He took the three-age system, originally devised by Christian Jürgensen Thomsen to organize Danish museum collections of archaeological materials, and sub-divided it further. He divided the Neolithic in Scandinavia into four numbered periods, I-IV, and the Nordic Bronze Age into six I-VI. He was the first to establish that the numerous Swedish petroglyphs were from the NordicBronze Age, by comparing axes portrayed in the petroglyphs with archaeological finds. Further he supported Thomsen's typology of gold bracteates from the migration period. By taking calendrical dates from the recently deciphered hieroglyphics of Ancient Egypt, Montelius employed a complex system of cross-dating through typologies and associated finds to apply absolute dates to archaeological finds and features all over Europe. His diffusionist theories were eventually displaced by more complex views of cultural interaction but following refinement his system of sub-divisions is still effectively in use. Montelius was made a member of the Swedish Academy in 1917. He and his wife, the feminist Agda Montelius, are buried in a dolmen grave in Norra begravningsplatsen in Solna, Sweden.
Strindberg on Montelius
The playwright August Strindberg, a contemporary of Montelius, held his work in low regard and satirized archaeology and Montelius' typological work in particular, in his De lycksaliges ö Montelius and his colleagues are compared to button collectors who typologize buttons in accordance to uses, number of holes, etcetera, founding the science of buttonology. The typologists then go on to demand professor chairs for themselves, considering the science highly important.