Illtyd Formation

The Illtyd Formation is an up to 1000-m thick geologic formation in Yukon. It preserves fossils dating back to the Dyerian subdivision of the Cambrian period, which spans the Stage 3 / Stage 4 boundary; it's considered to belong to the mid-upper Bonnia-Olenellus trilobite Zone. Top of the unit corresponds, more or less, to the top of Stage 4.[1][2] These fossils include Lower Cambrian trilobites'.[3]

Illtyd Formation
Stratigraphic range: Cambrian
TypeFormation
UnderliesSlats Creek Fm
Location
RegionYukon
CountryCanada

The type section is in the Wernecke Mtns; it corps out also in and to the S/SW of the Rochardson Moutnars. It possibly corresponds to the Sekwi Fm in the Macxkenzie mtns.[1]

Lowermost of the Palaeozoic strata west of the Richardson Mountains, angular unconformity at base, overlying various Precambrian strata. Silty limestones and massive dolomites. In places rhythmically bedded. Colour: Tan, brownish grey muds; sandier layers orange. Upper layers include oolites and oncolites. Trace fossils include burrows and 'worm trails'. In some places unit is massively faulted and altered / weathered, approaching marble grade metamorphism near faults.[1]

See also

References
  1. Morrow, D. W. (1999). Lower Paleozoic stratigraphy of northern Yukon Territory and northwestern District of Mackenzie. Bulletin 538. Geological Survey of Canada. ISBN 0-660-17808-7.
  2. Foster, John R. (2011). "sp.(Trilobita; Corynexochida) from the Chambless Limestone (Lower Cambrian) of the Marble Mountains, California: First Dorypygidae in a cratonic region of the southern Cordillera". PaleoBios. 30 (2).
  3. Fritz, W. H. (1991). Lower Cambrian trilobites from the Illtyd Formation, Wernecke Mountains, Yukon Territory. Bulletin. Geological Survey of Canada. ISBN 0-660-13836-0. ISSN 0068-7626.


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