G. K Jakobs's Toarcian (Early Jurassic) ammonoids from western North PDF

By G. K Jakobs

ISBN-10: 0660166437

ISBN-13: 9780660166438

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Additional info for Toarcian (Early Jurassic) ammonoids from western North America

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18, 19. 1968 1976 Phylloceras sp. indet. Description. Involute shell; shell smooth except for fine, radial growth lines. Septal sutures not visible. Discussion. The ornamentation and volution of the British Columbia specimens are typical of Phylloceras. Some of the specimens have faint undulations on the shell, probably due to secondary deformation during lithification. A specific identification is not possible due to the poor preservation. Occurrence. Phylloceras sp. indet. is represented in British Columba by poorly preserved whorl fragments from the Takwahoni Formation of the Tulsequah map area (Section 1, Loc.

Phantasma, and Hammatoceras sp. Smith (1980) mentioned the presence of Middle and Late Toarcian Phymatoceras and Dumortieria? from the Hyde Formation, probably the same fauna that was originally placed in the stephanoceratids and sonninids by Lupher (1941). Ammonites, and small pectinid bivalves similar to Bositra, are common in the Snowshoe Formation. The lower 40 m of the Snowshoe Formation have yielded a Late Toar­ cian ammonite fauna that includes Pleydellia cf. P. fluitans! (Dumortier), Hammatoceras speciosum, Dumortieria cf.

And Cleviceras sp. , from the Planulata Zone. The contact between the two members of the Phantom Creek Formation is an erosional hiatus (Cameron and Tipper, 1985; Jakobs, 1990), that increases in duration toward the south (Fig. 35). In the Skidegate Inlet area the belemnite sandstone member lies directly on the Whiteaves Formation. The contact between the Phantom Creek Formation and overlying strata of the Yakoun Group is an angular unconfor­ mity in central Graham Island (Cameron and Tipper, 1985).

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Toarcian (Early Jurassic) ammonoids from western North America by G. K Jakobs


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