These may have been why Charles Doolittle Walcott visited Mount Field in 1909. While taking photographs there Walcott found a slab of fossils that he described as "Phyllopod crustaceans".[1] From late August to early September 1909, his team, including his family, collected fossils there, and in 1910 Walcott opened a quarry that he and his colleagues re-visited in 1911, 1912, 1913, 1917 and 1924, bringing back over 60,000 specimens in total.[2] Walcott was Secretary of the Smithsonian Institution from 1907 to his death in 1927,[3] and this kept him so busy that he was still trying to make time for analyzing his finds two years before his death.[4] Although he drew attention to the exceptional detail of the specimens, which were the first known fossils of soft-bodied animals from the Cambrian period, he also had other research interests: the Early Paleozoic stratigraphy of the Canadian Rockies, which took up the great majority of his time there; and Precambrian fossils of algae and bacteria,[5] to which he assigned as much importance as to the fossils of animals.[2] He managed to publish four "preliminary" papers on the fossil animals in 1911 and 1912, and further articles in 1918, 1919 and 1920. Four years after Walcott's death his associate Charles Resser produced a package of additional descriptions from Walcott's notes.[6] Walcott's classifications of most of the fossils are now rejected,[1] but were supported at the time, and he accepted a change for one of the few where his conclusion was disputed.[2] Many of the later comments were made with the benefits of hindsight, and of techniques and concepts unknown in Walcott's time.[1][2]