. Smithsonian miscellaneous collections . ean leg 430 Ptychoparia 431 Pygidial endopodites of Triarthrus 415 Pygidium, use of, in swimming 428 Raymond, Dr. Percy E 378, 379, 380, 382, 384, 387, 388, 389, 413, 415, 424, 425, 429, 430. Raymond Memoir 379 Ruedemann, Rudolph 366, 368, 369, 371, 380, 389 Schuchert, Dr. Charles 366, 379, 380, 416 Sidneyia inexpectans 429 Spiral branchiae 407 Structure of exopodite of Calymene and Ccranrus 412 Supplementary notes t,77 Trails of trilobites, coxopodites and 429 Triarthrus becki Green 411, 413, 416-417, 420, 421, 422, 423 figured, pi. 95 ; figs. 20-23 4
. Smithsonian miscellaneous collections . ean leg 430 Ptychoparia 431 Pygidial endopodites of Triarthrus 415 Pygidium, use of, in swimming 428 Raymond, Dr. Percy E 378, 379, 380, 382, 384, 387, 388, 389, 413, 415, 424, 425, 429, 430. Raymond Memoir 379 Ruedemann, Rudolph 366, 368, 369, 371, 380, 389 Schuchert, Dr. Charles 366, 379, 380, 416 Sidneyia inexpectans 429 Spiral branchiae 407 Structure of exopodite of Calymene and Ccranrus 412 Supplementary notes t,77 Trails of trilobites, coxopodites and 429 Triarthrus becki Green 411, 413, 416-417, 420, 421, 422, 423 figured, pi. 95 ; figs. 20-23 439 pi. 104; figs. 12-15 455 text figs. 19, 19a 411 fig. 21, D 421 fig- 23 423 Trilobites, affinities of the 376 Trimtclcus concentricus Eaton, figured, pi. 104, figs. 6-11 454 Ulrich, Dr. E. 0 366, 368, 369, 371, 380, 381 Ventral integument 387 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 67, NUMBER 8 CAMBRIANGEOLOGY AND PALEONTOLOGY IV No. OF SOME POST CAMBRIAN AND CAMBRIAN CORDILLERAN FORMATIONS (2) BYCHARLES D. WALGOTT. (Publication 2673) CITY OF WASHINGTONPUBLISHED BY THE SMITHSONIAN INSTITUTIONMARCH 5, 1923 }c £orb Q0afitmore tyreee BALTIMORE, MD., U. S. A. CAMBRIAN GEOLOGY AND PALEONTOLOGY IV NO. 8.—NOMENCLATURE OF SOME POST CAMBRIAN AND CAMBRIAN CORDILLERAN FORMATIONS (2) By CHARLES D. WALCOTT CONTENTS pAGE Nomenclature 457 Robson Peak district 458 Chushina formation 458 Glacier Lake district 459 Sarbach formation 459 Mons formation 459 Lyell formation 460 Sullivan formation 461 Arctomys formation 461 Murchison formation 462 Kicking Horse Canyon 463 Glenogle formation 463 Beaverfoot formation 463 Front Range 463 Ghost River formation 463 Mount Wilson quartzite 464 Clearwater River 464 Mount Wilson 464 Occurrence in Sawback Range 465 Eureka Mining district, Nevada 466 Goodwin formation 466 Lower Ozarkian in Alberta 470 Sarceen 471 Observations 475 NOMENCLATURE A number of new names have been given to sedimentary forma-tions in connection with the study
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