Expeditions organized or participated in by the Smithsonian . back to Field. Three days were then spent onMount Stephen, at the famous trilobite beds, before breaking upcamp on September 8, 1909. 4-2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 59 \\hen opportunity offered during the fall and winter, held noteswere written up and studies made of the sections obtained during thesummer. As the results of these studies two papers were issuedin the Smithsonian Miscellaneous Collections. \olume 53 : Xo. 6,Publication 1934, Olenellus and other Genera of the Mesonacid?e,and Xo. 7, Publica
Expeditions organized or participated in by the Smithsonian . back to Field. Three days were then spent onMount Stephen, at the famous trilobite beds, before breaking upcamp on September 8, 1909. 4-2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 59 \\hen opportunity offered during the fall and winter, held noteswere written up and studies made of the sections obtained during thesummer. As the results of these studies two papers were issuedin the Smithsonian Miscellaneous Collections. \olume 53 : Xo. 6,Publication 1934, Olenellus and other Genera of the Mesonacid?e,and Xo. 7, Publication 1939. Pre-Cambrian Rocks of the Bow River\alley. Alberta, Canada. Preliminary studies were also made ofthe unique crustacean faima found in the Middle Cambrian rocks ofBursess Imc. 40.—Mountain showing folding of Upper Cambrian rocks on northwestside of Amiskwi Pass. Photograph by Walcott. Tn the field season of 1910, the secretary continued the stud}- of theCambrian strata of the section of the Rocky Mountains adjacent tothe main line of the Canadian Pacific Railway, special attention beinggiven to the Stephen formation. The outcrop of this formation wascarefully examined for manv miles along the mountain sides, with thehope of finding a locality where conditions had been favorable forthe preservation of the life of that epoch. The famous trilobite localityon the slope of ]\Iount Stephen above Field had long been known andmany species of fossils collected from it. but even there the conditions NO. II SMITHSONIAN EXPEDITIONS, I9IO-I9II 43 had not been favorable for the presence and preservation of examplesof much of the life which, from what was known of older faunas andthe advanced stage of development of the Upper Cambrian fauna,must have existed in the
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