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Arkell.1956.Jurassic..

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BAJOCIAN<br />

SOUTHERN ALASKA 537<br />

The middle and lower parts of the Tuxedni formation yield a remarkable<br />

variety of Bajocian ammonites. Few have yet been figured, but from<br />

the genera recorded by Imlay (1952, pp. 978-81) it appears that the<br />

following zones are represented:—<br />

Upper Bajocian: assemblage of Sphaeroceras, Polyplectites, Leptosphinctes<br />

and Lissoceras (p. 980).<br />

FIG. 85.—Jurassic outcrops of Canada and Alaska.<br />

Middle Bajocian:<br />

Humphriesianum Zone: Abundant Normannites, Teloceras and Chondroceras<br />

(p. 980).<br />

Sauzei and Sowerbyi Zones: Abundant Stemmatoceras, Stephanoceras<br />

and Sonninia, with a few Emileia, Chondroceras and Lissoceras (p. 981).<br />

Elsewhere is recorded an assemblage of Stemmatoceras, Emileia, Lissoceras,<br />

Leptosphinctes and an Oppeliid (p. 979). Elsewhere again, abundant<br />

Emileia, associated with Sonninia, Erycites, Pseudolioceras and an Oppeliid<br />

(p. 978).<br />

http://jurassic.ru/

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