. Smithsonian miscellaneous collections . iagoniclla cyathiformis Dawson 309 8. 8a. Khvetinokia metissica (Dawson). 316 9. Vauxia gracilenta Walcott 319 10. Eiffelia globosa Walcott 324 11, 12, 13, 14. Diagrammatic views of structure of Ncolenus serratus (Rominger) 371-375 15. Limbs of Neolenus 383 16. Outline of transverse section of thorax of 384 17. 17a. Outlines of portion of exopodite of 410 18. Photograph of wire spirals 411 19. 19a. Outlines of portion of exopodite of Triarthrus. .. 411 ILLUSTRATIONS xi FACE PAGE 20. Outline of restoration of fimbriated epipodite
. Smithsonian miscellaneous collections . iagoniclla cyathiformis Dawson 309 8. 8a. Khvetinokia metissica (Dawson). 316 9. Vauxia gracilenta Walcott 319 10. Eiffelia globosa Walcott 324 11, 12, 13, 14. Diagrammatic views of structure of Ncolenus serratus (Rominger) 371-375 15. Limbs of Neolenus 383 16. Outline of transverse section of thorax of 384 17. 17a. Outlines of portion of exopodite of 410 18. Photograph of wire spirals 411 19. 19a. Outlines of portion of exopodite of Triarthrus. .. 411 ILLUSTRATIONS xi FACE PAGE 20. Outline of restoration of fimbriated epipodite of Ceraurus 419 21. Thoracic limb of Neolenus, Ceraurus, Calymene, and Triarthrus 421 22. Diagrammatic outline of a coxopodite with cross sec- tions indicated , 422 23. Exopodite of Triarthrus becki Conrad 423 24. Cambrian-Ozarkian-Ordovician correlation Table 470 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOLUME 67, NUMBER 1 CAMBRIANGEOLOGY AND PALEONTOLOGY IV No. 1. NOMENCLATURE OF SOME CAMBRIANCORDILLERAN FORMATIONS BYCHARLES D. WALCOTT. (Publication 2444) CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION MAY 9, 1917 Zfye £ovb (g»afttmore (Preee BALTIMORE, MD., U. S. A. CAMBRIAN GEOLOGY AND PALEONTOLOGY IV No. i.—NOMENCLATURE OF SOME CAMBRIANCORDILLERAN FORMATIONS By CHARLES D. WALCOTT CONTENTS PAGE Introduction I The Ptarmigan formation I Section at Ptarmigan Pass and Peak 2 The Ross Lake shale member of the Ptarmigan formation (Albertella zone) 4 Fort Mountain formation 4 Ptarmigan Peak section 5 Fairview Mountain section 5 Eldorado formation 6 Dunderberg formation, Walcott 7 Gordon shale 7 Chisholm shale 8 INTRODUCTION This is the second title on this subject, the first having appearedin Since that date a few new names for formations of Cam-brian age in the Cordilleran area have been proposed, and I now havetwo new ones and a definition of one used by me in THE PTARMIGAN FORMATION The name Ptarmigan formation is proposed for a series of lime-stones
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