UPPERMOST CAMBRIAN AND LOWER ORDOVICIAN CONODONT BIOSTRATIGRAPHY OF THE SURVEY PEAK FORMATION (IBEXIAN TREMADOC), WILCOX-PASS, ALBERTA, CANADA/

The Survey Peak Formation (350 m thick) consists of calcareous shale, mudstone, siltstone, and limestone-pebble conglomerate, and is formall y divided into four revised members, successively: Basal Silty Member, Putty Shale Member, Middle Carbonate Member, and Upper Carbonate Memb er. The Wilcox Pass section, Jasper National Park, Alberta, provides a standard stratigraphic section for the southern Canadian Rocky Mounta ins and yielded over 4,500 conodonts from 87 samples which are of high species diversity, moderately well preserved, with a conodont Color A lteration Index (CAI) value of 3. Over 50 multielement species represe nting some 20 genera are identified, and most are illustrated. Conodon t zones recognized in the four members include: Basal Silty Member-Eoc onodontus notchpeakensis, Cordylodus proavus, C. caboti, C. intermediu s, and C. lindstromi; Putty Shale Member-lower C. angulatus; Middle Ca rbonate Member-upper C. angulatus and coeval Rossodus manitouensis, Co laptoconus priscus (new) and Scolopodus cf. S. vex; Upper Carbonate Me mber-Striatodontus lanceolatus-S. striatus. In total, ten conodont lin eage and assemblage zones are recognized within the Survey Peak Format ion. Most can now be precisely correlated with trilobite faunas and ac ritarch microfloras described from this section, and with conodont zon es established for the Great Basin area, Utah-Nevada, and for western Newfoundland. The Survey Peak Formation is of uppermost Cambrian to lo wer Ibexian (Tremadoc) in age with the Cambrian-Ordovician boundary pl aced between 26 and 29 m above the base of the formation in the Basal Silty Member.