Nechako River Map-Area Belemnites sp. indet. “Rhynchonella’ sp. indet. 5. GSC locality 20119. East side of small island near the outlet of Chelaslie Lake, Nechako area, B.C. “Terebratula” sp. indet. Pelecypods div. gen. et sp. indet. 6. GSC plant locality No. 4229. On road below Skins Dome in new road-cut, (B.C.). Determinations: Filicales Gleicheniaceae Gleichenites cf. G. nordenskiéldi a vegetative branch of a conifer. 7. GSC locality 21887. From hill 1 mile west of Kluskus village. Argillaceous tuffs and coarse tuffs. Belemnoids (indeterminate fragments) 8. GSC locality 21889. South side of Kuyakuz Mountain, 4 mile from Kuyakuz Lake. The collection consists of fragmentary pelecypods and echinoids which occur in fine tuff. The state of preservation is too poor for any detailed determination. No distinctive forms are present. Upper Jurassic Rocks Argillite and argillaceous limestone, before the flooding caused by the Kenney Dam, outcropped on Nechako River near the mouth of Big Bend Creek. None of these is now exposed. Two small areas of similar rocks that outcrop 5 miles to the east were tentatively mapped as an Upper Jurassic part of the Hazelton Group (Tipper, 1955) but, as mentioned on page 23, the Upper Jurassic rocks are now separated from the Hazelton Group and are mapped as Bowser Group. It would seem logical, therefore, to map these rocks as Bowser Group but as there is no known direct connection with the Bowser basin and little information on the extent, thickness, and lithology of these Upper Jurassic rocks, it seems better to map them as unit 7 unnamed. The extension of this group of rocks may well be southeastward, where rocks of similar age are known in the Ashcroft area (Duffell and McTaggart, 1952, pp. 31-33). Lithology These rocks are entirely sedimentary. Black, sheared argillites and argillaceous shales outcropped along Nechako River. Farther east, the outcrops are not sheared 30