New occurrences of jurassic rocks and fossils in central and northern Yukon territory

New occurrences of two Lower Devonian graptolites from northern Yukon

Canadian Journal of Earth Sciences ◽

10.1139/e79-098 ◽

1979 ◽

Vol 16 (5) ◽

pp. 1121-1124 ◽

Cited By ~ 1

Author(s):

Alfred C. Lenz

Keyword(s):

Lower Devonian ◽

Yukon Territory ◽

Canadian Cordillera ◽

Early Devonian ◽

First Time ◽

Richardson Mountains ◽

New Occurrences

Two species of Early Devonian graptolites are described from the Richardson Mountains, northern Yukon Territory; these are ?Pristiograptus sp. and Monograptus fanicus Koren', the latter being reported for the first time from the northern Canadian Cordillera. Associated grapto lites as well as the presence of M. fanicus indicate a Pragian age. The presence of M. fanicus helps fill the zonal gap between the late Lochkovian hercyniens Zone, and probable late Pragian thomasi and yukonensis Zones, and suggests that lower and upper Pragian substage divisions are possibly recognizable in the graptoiite facies.

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J. A. Jeletzky 1980. Lower Cretaceous and Jurassic rocks of McDougall Pass area and some adjacent areas of north-central Richardson Mountains, northern Yukon Territory and northwestern district of Mackenzie, N.W.T. (NTS-116P/9 and 116P/10): a reappraisal. Geol. Surv. Can. Paper 78–22. vi + 35 pp., 9 figs (1 in pocket), 3 plates. Ottawa. Price $5.00 (Canada); $6.00 (other countries). ISBN 0 660 10280 3.

Geological Magazine ◽

10.1017/s0016756800028818 ◽

1980 ◽

Vol 117 (5) ◽

pp. 510-510

Author(s):

C. A. G. P.

Keyword(s):

Lower Cretaceous ◽

Yukon Territory ◽

North Central ◽

Jurassic Rocks ◽

Richardson Mountains

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Hettangian (Lower Jurassic) rocks and faunas, northern Yukon Territory

Canadian Journal of Earth Sciences ◽

10.1139/e77-010 ◽

1977 ◽

Vol 14 (1) ◽

pp. 89-101 ◽

Cited By ~ 5

Author(s):

Hans Frebold ◽

T. P. Poulton

Keyword(s):

Canadian Arctic ◽

Lower Jurassic ◽

Yukon Territory ◽

Lake Area ◽

Jurassic Rocks ◽

First Time

The Lower Jurassic Hettangian Stage is documented with certainty for the first time in the Canadian Arctic. It is represented by a basal Jurassic sandstone unit in the Bonnet Lake area of northern Yukon Territory. The two subzones of the Early Hettangian Planorbis Zone, i.e., the Planorbis Subzone and the Johnstoni Subzone, are indicated by poorly preserved Psiloceras sp. indet. and Psiloceras (Caloceras) cf. P. (C.) johnstoni (J. de C. Sowerby), respectively. The varied but poorly preserved bivalve fauna associated with P. (C.) cf. P. (C.) johnstoni includes Prosogyrotrigonia (?) sp. cf. P. inouyei (Yehara), Cardinia sp. cf. C. hybrida (J. Sowerby), C. sp. aff. C. concinna (J. Sowerby), Pleuromya (?) sp., Meleagrinella (?) sp., Oxytoma (Oxytoma) sp., and Parallelodon (?) sp. The bivalves closely resemble approximately coeval forms described from Japan. The above-mentioned faunas are figured as is a specimen of Psiloceras cf. P. erugatum (Phillips), which was previously described from the Hettangian of southern Yukon. Other occurrences of the Hettangian in Canada and Alaska are reviewed.

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