General Geology

2. Collections from Euchiniko River.

Most of the many poorly preserved and not accurately determinable ammonites
in this collection have affinities to Sonninia and Witchellia. The age of this fauna
is probably early middle Bajocian (early Middle Jurassic). Its stratigraphic position
is probably the same as that of the Kuyakuz Mountain fauna.

These two Bajocian collections occur near the top of their respective sections.
As pointed out by Frebold, the fauna is probably younger than the Tmetoceras
bed, which is considered to be the oldest of the Middle Jurassic (Frebold, 1951,
pp. 18-21).

The chert-pebble conglomerate unit yielded several collections of fossils,
both fauna and flora, but no index fossils were present. There is no significant
Stratigraphic break between it and the overlying Middle Jurassic unit, and for
this reason it is believed that the chert-pebble conglomerate unit represents the
earliest Middle Jurassic strata and is correlative with the sedimentary strata of
the Whitesail Lake map-area that contain the Tmetoceras fauna. However, an
Early Jurassic age must be considered possible until a more exact dating of the
unit is obtained.

In summary, as now restricted, the Hazelton Group in Nechako area con-
tains Middle Jurassic strata only, mainly early Middle Jurassic.

Several other fossil collections were made but none contained diagnostic
fossils. Only a broad age, Jurassic or Cretaceous, can be suggested. The following
identifications were all by H. Frebold except No. 6 which was bya\Vseless Bry,
formerly of the Geological Survey of Canada. The first seven collections were from
the chert-pebble conglomerate unit and the eighth from the Middle Jurassic unit.
These collections are mentioned as they suggest the best localities for future, more
intensive search.

1. GSC locality 16831. 2 miles north of Ootsa Lookout.
Pecten (Entolium) sp. indet.
Macradon sp. indet.
other indeterminable pelecypods
Belemnites sp. indet.

2. GSC locality 16832. 2 miles north of Ootsa Lookout.
Ammonites gen. and sp. indet.
Cucullae? sp. indet.
Leda? sp. indet.
Corbula? sp. indet.
other badly preserved pelecypods
“Rhynchonella” sp. indet.

3. GSC locality 16833. 5 miles north of Ootsa Lookout, in sheared argillite.
Belemnites sp. indet.
Indeterminable pelecypods

4. GSC locality 20116. 14 miles from the north end of Fawnie Nose Mountain,
on crest of ridge.

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