Type Locality:

Extensively developed along the 141st Meridian between the Porcupine and Yukon rivers.

Distribution:

More than 1,600 m (5,000 ft) occurs in the Alaska-Yukon boundary area between the Porcupine and Yukon rivers.

Locality Data:

Thickness(m): Minimum 1600.

Lithology:

Mainly quartzites, dolomites, shales, slates, phyllites and occasionally conglomerate. Basic volcanics are locally interbedded with the sediments.

Relationship:

It overlies the Yukon Gp and lies below Ordovician sediments.

Remark:

The informal division of the Tindir Group into the Upper and Lower Tindir groups was first distinguished by Payne and Allison (1981), despite the fact that no unconformable contacts had been observed between them. Young (1982) extended their work by separating the Lower Tindir Group into six informal units and the Upper Tindir Group into five informal units. The Lower Tindir Group units of Young (1982) were further modified by Van Kooten et al. (1997) and Macdonald et al. (2010a). Fifteenmile Group has been redefined and replaces the abandoned Tindir Group in the Ogilvie Mountains of western Yukon (Macdonald et al., 2011)

Other Citations:

Cairnes, 1914; Gabrielse, 1967; Payne and Allison, 1981; Young, 1982; Van Kooten et al., 1997; Macdonald et al., 2010a; Macdonald et al., 2011.

References:

Cairnes, D.D., 1914. Yukon-Alaska International Boundary between Porcupine and Yukon rivers; Geological Survey of Canada, Memoir 67, 161 p.

Macdonald, F.A., Cohen, P.A., Dudás, F.O. and Schrag, D.P., 2010a. Early Neoproterozoic scale microfossils in the Lower Tindir Group of Alaska and the Yukon Territory. Geology, 38, pp. 143-146.

Macdonald, F.A., Smith, E.F., Strauss, J.V., Cox, G.M, Halverson, G.P. and Roots, C.F., 2011. Neoproterozoic and early Paleozoic correlations in the western Ogilvie Mountains, Yukon. In: Yukon Exploration and Geology 2010, K.E. MacFarlane, L.H. Weston and C. Relf (eds.), Yukon Geological Survey, p. 161-182.

Payne, M.W. and Allison, C.W.A., 1981. Paleozoic continental-margin sedimentation in east-central Alaska. Geology, 9, pp. 274-279.

Van Kooten, G.K., Watts, A.B., Coogan, J., Mount, V.S., Swenson, R.F., Daggett, P.H., Clough, J.G., Roberts, C.T. and Bergman, S.C., 1997. Geological Investigations of the Kandik Area, Alaska and Adjacent Yukon Territory, Canada. Alaska Division of Geological and Geophysical Surveys, Report of Investigations 96-6A, 3 sheets, scale 1:125 000.

Young, 1982. The late Proterozoic Tindir Group, eastcentral Alaska; Evolution of a continental margin. Geological Society of America Bulletin, 93, pp. 759-783.